Application of 172418-32-5

Although many compounds look similar to this compound(172418-32-5)SDS of cas: 172418-32-5, numerous studies have shown that this compound(SMILES:CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium, is researched, Molecular C46H46O4P2Pd2, CAS is 172418-32-5, about Preparation and Physicochemical Properties of [6]Helicenes Fluorinated at Terminal Rings, the main research direction is fluorinated helicene preparation physicochem property.SDS of cas: 172418-32-5.

The first racemization-stable helicene derivatives fluorinated at terminal rings, 1,2,3,4-tetrafluoro[6]helicene and 1,2,3,4,13,14,15,16-octafluoro[6]helicene, were synthesized via the Wittig reaction followed by oxidative photocyclization in an overall yield of 41% and 76%. The changed electronic structure in fluorinated helicenes was reflected in a slight shift of UV-vis absorption, fluorescence excitation, and emission spectra maxima when compared to unsubstituted [6]helicene. Cyclic voltammetry revealed a moderate decrease in the HOMO-LUMO gap with increasing fluorination. The sp. rotation of tetrafluoro[6]helicene enantiomers was found to be approx. 25% lower than that of unsubstituted [6]helicene. The theor. study of the racemization barrier suggested a reasonable shift toward higher energy with increasing fluorination. The increasing fluorination also significantly affected the intermol. interactions in the crystal lattice. The observed CH···F interactions led to the formation of 1D-mol. chains in the crystal structures of both fluorinated helicenes.

Although many compounds look similar to this compound(172418-32-5)SDS of cas: 172418-32-5, numerous studies have shown that this compound(SMILES:CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Although many compounds look similar to this compound(14694-95-2)Application In Synthesis of Tris(triphenylphosphine)chlororhodium, numerous studies have shown that this compound(SMILES:[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 14694-95-2, is researched, SMILESS is [Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9, Molecular C54H45ClP3RhJournal, Industrial & Engineering Chemistry Research called Hydrogenation of Polybutadiene at High Pressure, Author is Menossi, Matias; Ciolino, Andres; Quinzani, Lidia M.; Zabaloy, Marcelo S.; Milanesio, Juan M., the main research direction is hydrogenation polybutadiene high pressure pressure.Application In Synthesis of Tris(triphenylphosphine)chlororhodium.

The problem of low reaction rate due to poor mass transfer in the two-fluid-phase conventional hydrogenation of unsaturated polymers can be overcome by using di-Me ether/n-pentane as a light solvent mixture as the medium to carry out the reaction. In this work, a series of polybutadiene (PB) batch hydrogenation reactions were performed at high-pressure using Wilkinson/triphenylphosphine as a homogeneous catalyst/cocatalyst. Hydrogenated PBs with 86%-100% of saturation degree were obtained by changing processing variables: overall d., temperature, stirring frequency, initial hydrogen (H2)/double bonds ratio, global concentration of catalyst/cocatalyst, and reaction time. The variables that most affect the process are temperature, H2 excess, stirring frequency, and reaction time. By increasing these variables, the larger the saturation degree will be. The use of Wilkinson’s catalyst gives place to totally hydrogenated PB four times faster than conventional hydrogenation based on homogeneous catalysis (e.g., RhCl(PPh3)3, RhCl(P(C6H4-m-SO3Na))3, RhCl(PPh2(C6H4-m-SO3Na))) but giving place to some scission and crosslinking reactions.

Although many compounds look similar to this compound(14694-95-2)Application In Synthesis of Tris(triphenylphosphine)chlororhodium, numerous studies have shown that this compound(SMILES:[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Although many compounds look similar to this compound(40400-13-3)HPLC of Formula: 40400-13-3, numerous studies have shown that this compound(SMILES:BrCC1=C(I)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Light-promoted copper-catalyzed cage C-arylation of o-carboranes: facile synthesis of 1-aryl-o-carboranes and o-carborane-fused cyclics》. Authors are Ni, Hangcheng; Lu, Zhenpin; Xie, Zuowei.The article about the compound:1-(Bromomethyl)-2-iodobenzenecas:40400-13-3,SMILESS:BrCC1=C(I)C=CC=C1).HPLC of Formula: 40400-13-3. Through the article, more information about this compound (cas:40400-13-3) is conveyed.

Light-promoted, copper catalyzed cage C-H arylation of o-carboranes with aryl halides has been achieved, leading to the facile synthesis of a variety of 1-aryl-o-carboranes and o-carborane-fused cyclics. This method has the following features: (1) using o-carboranes instead of prefunctionalized iodocarboranes as starting materials; (2) employing earth abundant copper as a catalyst; and (3) room-temperature reaction. Control experiments suggest that the reaction proceeds via Cu-catalyzed radical coupling.

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Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

What I Wish Everyone Knew About 49609-84-9

Although many compounds look similar to this compound(49609-84-9)Application In Synthesis of 2-Chloronicotinoyl chloride, numerous studies have shown that this compound(SMILES:O=C(Cl)C1=CC=CN=C1Cl), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Application In Synthesis of 2-Chloronicotinoyl chloride. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Chloronicotinoyl chloride, is researched, Molecular C6H3Cl2NO, CAS is 49609-84-9, about Synthesis and pharmacological characterization of ethylenediamine synthetic opioids in human μ-opiate receptor 1 (OPRM1) expressing cells. Author is Hsu, Tom; Mallareddy, Jayapal R.; Yoshida, Kayla; Bustamante, Vincent; Lee, Tim; Krstenansky, John L.; Zambon, Alexander C..

Opioids are powerful analgesics acting via the human μ-opiate receptor (hMOR). Opioid use is associated with adverse effects such as tolerance, addiction, respiratory depression, and constipation. Two synthetic opioids, AH-7921 and U-47700 that were developed in the 1970s but never marketed, have recently appeared on the illegal drug market and in forensic toxicol. reports. These agents were initially characterized for their analgesic activity in rodents; however, their pharmacol. at hMOR has not been delineated. Thus, we synthesized over 50 chem. analogs based on core AH-7921 and U-47700 structures to assess for their ability to couple to Gαi signaling and induce hMOR internalization. For both the AH-7921 and U-47700 analogs, the 3,4-dichlorobenzoyl substituents were the most potent with comparable EC50 values for inhibition of cAMP accumulation; 26.49 ± 11.2 nmol L-1 and 8.8 ± 4.9 nmol L-1, resp. Despite similar potencies for Gαi coupling, these two compounds had strikingly different hMOR internalization efficacies: U-47700 (10μmol L-1) induced ∼25% hMOR internalization similar to DAMGO while AH-7921 (10μmol L-1) induced ∼5% hMOR internalization similar to morphine. In addition, the (R,R)-enantiomer of U-47700 is significantly more potent than the (S,S)-enantiomer at hMOR. In conclusion, these data suggest that U-47700 and AH-7921 analogs have high analgesic potential in humans, but with divergent receptor internalization profiles, suggesting that they may exhibit differences in clin. utility or abuse potential.

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Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Derivation of elementary reaction about 49609-84-9

Although many compounds look similar to this compound(49609-84-9)Application of 49609-84-9, numerous studies have shown that this compound(SMILES:O=C(Cl)C1=CC=CN=C1Cl), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 49609-84-9, is researched, Molecular C6H3Cl2NO, about Germacrane Sesquiterpenoids as a New Type of Anticardiac Fibrosis Agent Targeting Transforming Growth Factor β Type I Receptor, the main research direction is germacrane sesquiterpenoid Aristolochia anticardiac fibrosis fibronectin alpha SMA Smad.Application of 49609-84-9.

A germacrane sesquiterpenoid library containing 30 compounds (2-31) was constructed by structural modification of a major component aristolactone (1) from the traditional Chinese medicine Aristolochia yunnanensis. Compound 11 was identified as a promising anticardiac fibrosis agent by systematic screening of this library. 11 could inhibit the expression of fibronectin (FN), α-smooth muscle actin (α-SMA), and collagens in transforming growth factor β 1 (TGFβ1)-stimulated cardiac fibroblasts at a micromolar level and ameliorate myocardial fibrosis and heart function in abdominal aortic constriction (AAC) rats at 5 mg/kg dose. Mechanistic study revealed that 11 inhibited the TGFβ/small mother against decapentaplegic (Smad) signaling pathway by targeting TGFβ type I receptor (IC50 = 14.9 ± 1.6 nM). The structure-activity relationships (SARs) study indicated that the unsaturated γ-lactone ring and oxidation of C-1 were important to the activity. These findings may provide a new type of structural motif for future anticardiac fibrosis drug development.

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Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Extended knowledge of 40400-13-3

Although many compounds look similar to this compound(40400-13-3)Application In Synthesis of 1-(Bromomethyl)-2-iodobenzene, numerous studies have shown that this compound(SMILES:BrCC1=C(I)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 1-(Bromomethyl)-2-iodobenzene(SMILESS: BrCC1=C(I)C=CC=C1,cas:40400-13-3) is researched.Formula: C46H46O4P2Pd2. The article 《Substituted dienes prepared from betulinic acid – Synthesis, cytotoxicity, mechanism of action, and pharmacological parameters》 in relation to this compound, is published in European Journal of Medicinal Chemistry. Let’s take a look at the latest research on this compound (cas:40400-13-3).

A set of new substituted dienes were synthesized from betulinic acid by its oxidation to 30-oxobetulinic acid followed by the Wittig reaction. Cytotoxicity of all compounds was tested in vitro in eight cancer cell lines and two noncancer fibroblasts. Almost all dienes were more cytotoxic than betulinic acid. Four compounds had IC50 below 5μmol/L; I and II were selected for studies of the mechanism of action. Cell cycle anal. revealed an increase in the number of apoptotic cells at 5 x IC50 concentration, where activation of irreversible changes leading to cell death can be expected. Both I and II led to the accumulation of cells in the G0/G1 phase with partial inhibition of DNA/RNA synthesis at 1 x IC50 and almost complete inhibition at 5 x IC50. Interestingly, compound II at 5 x IC50 caused the accumulation of cells in the S phase. Higher concentrations of tested drugs probably inhibit more off-targets than lower concentrations Mechanisms disrupting cellular metabolism can induce the accumulation of cells in the S phase. Both compounds I and II trigger selective apoptosis in cancer cells via intrinsic pathway, which we have demonstrated by changes in the expression of the crucial apoptosis-related protein. Pharmacol. parameters of derivative I were superior to II, therefore I was the finally selected candidate for the development of anticancer drug.

Although many compounds look similar to this compound(40400-13-3)Application In Synthesis of 1-(Bromomethyl)-2-iodobenzene, numerous studies have shown that this compound(SMILES:BrCC1=C(I)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Although many compounds look similar to this compound(172418-32-5)Formula: C46H46O4P2Pd2, numerous studies have shown that this compound(SMILES:CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Formula: C46H46O4P2Pd2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium, is researched, Molecular C46H46O4P2Pd2, CAS is 172418-32-5, about Synthesis, x-ray analysis, and evaluation of the optoelectronic properties of a new thia[6]helicene. Author is Moussa, Souad; Aloui, Faouzi; Retailleau, Pascal; Ben Hassine, Bechir.

The synthesis and structural characterization of a new hexahelicene thia analog was reported. This compound features a new type of structure bearing a Br atom. Suitable crystals indicated that its conformation closely resembles that of the unsubstituted [6]helicene, whose idealized symmetry is C2. The optoelectronic properties of this helical hexacyclic system were determined and exhibit a very interesting behavior.

Although many compounds look similar to this compound(172418-32-5)Formula: C46H46O4P2Pd2, numerous studies have shown that this compound(SMILES:CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Although many compounds look similar to this compound(1824-94-8)COA of Formula: C7H14O6, numerous studies have shown that this compound(SMILES:O[C@H]([C@H]([C@H]([C@@H](CO)O1)O)O)[C@@H]1OC), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 1824-94-8, is researched, Molecular C7H14O6, about Improving the accuracy of solid-state nuclear magnetic resonance chemical shift prediction with a simple molecular correction, the main research direction is solid state NMR chem shift mol correction.COA of Formula: C7H14O6.

A fast, straightforward method for computing NMR chem. shieldings of crystalline solids is proposed. The method combines the advantages of both conventional approaches: periodic calculations using plane-wave basis sets and mol. computational approaches. The periodic calculations capture the periodic nature of crystalline solids, but the computational level of the electronic structure calculation is limited to general-gradient-approximation (GGA) d. functionals. It is demonstrated that a correction to the GGA result calculated on an isolated mol. at a higher level of theory significantly improves the correlations between exptl. and calculated chem. shifts while adding almost no addnl. computational cost. Corrections calculated with a hybrid d. functional improved the accuracy of 13C, 15N and 17O chem. shift predictions significantly and allowed identifying Errors in previously published exptl. data. Applications of the approach to crystalline isocytosine, methacrylamide, and testosterone are presented.

Although many compounds look similar to this compound(1824-94-8)COA of Formula: C7H14O6, numerous studies have shown that this compound(SMILES:O[C@H]([C@H]([C@H]([C@@H](CO)O1)O)O)[C@@H]1OC), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Although many compounds look similar to this compound(14694-95-2)Safety of Tris(triphenylphosphine)chlororhodium, numerous studies have shown that this compound(SMILES:[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, Non-U.S. Gov’t, ACS Biomaterials Science & Engineering called Thromboresistance of Silicones Modified with PEO-Silane Amphiphiles, Author is Ngo, Bryan Khai D.; Barry, Mikayla E.; Lim, Kendrick K.; Johnson, Jessica C.; Luna, David J.; Pandian, Navaneeth K. R.; Jain, Abhishek; Grunlan, Melissa A., which mentions a compound: 14694-95-2, SMILESS is [Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9, Molecular C54H45ClP3Rh, Safety of Tris(triphenylphosphine)chlororhodium.

The antifouling properties of poly(ethylene oxide) (PEO)-silane amphiphiles as surface-modifying additives (SMAs) in a condensation cure silicone have been previously demonstrated against simple protein solutions Comprising an oligo(dimethylsiloxane) tether (m = 13 or 30) and PEO segment (n = 8), sustained protein resistance was achieved even in the absence of a cross-linkable triethoxysilane group, particularly when comprising the longer tether. To probe their potential for thromboresistance, PEO-silane amphiphile SMAs were used to bulk-modify silicones and evaluated for adhesion resistance against whole human blood under both static and dynamic conditions. Both a crosslinkable (XL diblock, m = 13) and a non-crosslinkable (Diblock, m = 30) SMA were evaluated at various concentrations (5-50μmol SMA/g silicone) in a condensation cure silicone. Under static conditions, silicones modified with either SMA at concentrations of 10μmol/g or greater were effective in reducing adhesion of human fibrinogen and platelets. Dynamic testing further showed that modified silicones were able to reduce protein adsorption and thrombus formation. This occurred at 5 and 10μmol/g for silicones modified with XL diblock, m = 13 and diblock, m = 30 SMAs, resp. Combined, these results indicate the effectiveness of PEO-silane amphiphiles as SMAs in silicone for improved thromboresistance.

Although many compounds look similar to this compound(14694-95-2)Safety of Tris(triphenylphosphine)chlororhodium, numerous studies have shown that this compound(SMILES:[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

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Although many compounds look similar to this compound(40400-13-3)Computed Properties of C7H6BrI, numerous studies have shown that this compound(SMILES:BrCC1=C(I)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Computed Properties of C7H6BrI. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 1-(Bromomethyl)-2-iodobenzene, is researched, Molecular C7H6BrI, CAS is 40400-13-3, about α-Oxocarboxylic Acids as Three-Carbon Insertion Units for Palladium-Catalyzed Decarboxylative Cascade Synthesis of Diverse Fused Heteropolycycles. Author is Zhou, Liwei; Qiao, Shujia; Zhou, Fengru; Xuchen, Xinyu; Deng, Guobo; Yang, Yuan; Liang, Yun.

A novel palladium-catalyzed decarboxylative cascade cyclization for the assembly of diverse fused heteropolycycles by employing α-oxocarboxylic acids as three-carbon insertion units is reported. This protocol enables the synthesis of isoquinolinedione- and indolo[2,1-a]isoquinolinone-fused benzocycloheptanones in moderate to good yields by the use of different aryl iodides, including alkene-tethered 2-iodobenzamides and 2-(2-iodophenyl)-1H-indoles. Notably, the approach achieves simultaneous construction of both six- and seven-membered rings via sequential intramol. carbopalladation, C-H activation, and decarboxylation.

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Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate