Category: 139139-86-9

Tanaka, Ken; Fukawa, Naohiro; Suda, Takeshi; Noguchi, Keiichi published the artcile< One-Step Construction of Five Successive Rings by Rhodium-Catalyzed Intermolecular Double [2+2+2] Cycloaddition: Enantioenriched [9]Helicene-Like Molecules>, COA of Formula: C44H40P2, the main research area is tetrayne diyne intermol cycloaddition rhodium catalyst; helicene asym preparation crystal mol structure.

The synthesis of [9]helicene-like mols. by rhodium-catalyzed intermol. double [2+2+2] cycloadditions is presented. Crystal structure and photophys. data for the compounds are also determined

Angewandte Chemie, International Edition published new progress about Alkadiynes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, COA of Formula: C44H40P2.

Referemce:
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

Suda, Takeshi; Noguchi, Keiichi; Tanaka, Ken published the artcile< Rhodium-Catalyzed Asymmetric Formal Olefination or Cycloaddition: 1,3-Dicarbonyl Compounds Reacting with 1,6-Diynes or 1,6-Enynes>, Product Details of C44H40P2, the main research area is dicarbonyl stereoselective olefination diyne enyne rhodium BINAP segphos catalyst.

The Rh(I)/(R)-H8-BINAP complex was used as the catalyst in the asym. intermol. olefination of enolizable 1,3-dicarbonyl compounds with 1,6-diynes by [2+2+2]cycloaddition followed by electrocyclic ring opening. The same reaction was also accomplished with 1,6-enynes by using Rh(I)/S-segphos as catalyst.

Angewandte Chemie, International Edition published new progress about Alkadiynes Role: RCT (Reactant), RACT (Reactant or Reagent). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Product Details of C44H40P2.

Referemce:
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

Tanaka, Rie; Noguchi, Keiichi; Tanaka, Ken published the artcile< Rhodium-catalyzed asymmetric reductive cyclization of heteroatom-linked 5-alkynals with heteroatom-substituted acetaldehydes>, Related Products of 139139-86-9, the main research area is heteroatom alkynal acetaldehyde rhodium catalyst asym reductive cyclization.

We have established that a cationic rhodium(I)/H8-BINAP complex catalyzes the asym. reductive cyclization of heteroatom-linked 5-alkynals with heteroatom-substituted acetaldehydes in good yields with outstanding enantioselectivity.

Journal of the American Chemical Society published new progress about Alkynals Role: RCT (Reactant), RACT (Reactant or Reagent). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Related Products of 139139-86-9.

Referemce:
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

Brusoe, Andrew T.; Alexanian, Erik J. published the artcile< Rhodium(I)-Catalyzed Ene-Allene-Allene [2+2+2] Cycloadditions: Stereoselective Synthesis of Complex trans-Fused Carbocycles>, Application In Synthesis of 139139-86-9, the main research area is eneallene allene rhodium catalyzed cycloaddition; hydrindane decalin stereoselective preparation four contiguous stereocenters; fused carbocycle stereoselective preparation.

The rhodium-catalyzed [2+2+2] cycloaddition of ene-allenes with allenes was utilized for the construction of a variety of trans-fused hydrindanes and decalins in a highly convergent manner, with three σ bonds, two rings, and up to four contiguous stereocenters generated in a regio- and stereoselective fashion.

Angewandte Chemie, International Edition published new progress about Allenes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Application In Synthesis of 139139-86-9.

Referemce:
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

Murai, Masahito; Takeshima, Hirotaka; Morita, Haruka; Kuninobu, Yoichiro; Takai, Kazuhiko published the artcile< Acceleration effects of phosphine ligands on the rhodium-catalyzed dehydrogenative silylation and germylation of unactivated C(sp3)-H bonds>, Synthetic Route of 139139-86-9, the main research area is diphosphine ligand rhodium catalysis dehydrogenative silylation germylation.

The current work describes the marked rate of acceleration caused by phosphine ligands on the rhodium-catalyzed dehydrogenative silylation and germylation of unactivated C(sp3)-H bonds. The reactivity was affected by the steric and electronic nature of the phosphine ligands. The use of the bulky and electron-rich diphosphine ligand (R)-DTBM-SEGPHOS was highly effective to yield the dehydrogenative silylation products selectively in the presence of a hydrogen acceptor. An appropriate choice of C2-sym. chiral diphosphine ligand enables the asym. dehydrogenative silylation via the enantioselective desymmetrization of the C(sp3)-H bond. The unprecedented catalytic germylation of C(sp3)-H bonds with dehydrogenation was also examined with the combination of the rhodium complex and a wide bite angle diphosphine ligand to provide the corresponding 2,3-dihydrobenzo[b]germoles in good yield.

Journal of Organic Chemistry published new progress about Cyclization (silylative). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Synthetic Route of 139139-86-9.

Referemce:
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

Tanaka, Ken; Sagae, Hiromi; Toyoda, Kazuki; Hirano, Masao published the artcile< Enantioselective synthesis of planar-chiral metacyclophanes through cationic Rh(I)/modified-BINAP-catalyzed inter- and intramolecular alkyne cyclotrimerizations>, Safety of (R)-2,2′-Bis(diphenylphosphino)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-binaphthyl, the main research area is enantioselective synthesis chiral metacyclophane rhodium BINAP catalyst alkyne cyclotrimerization.

We have achieved the first catalytic enantioselective synthesis of planar-chiral metacyclophanes by means of cationic Rh(I)/(S)-xyl-H8-BINAP or (R)-H8-BINAP complex-catalyzed inter- and intramol. alkyne cyclotrimerizations. This highly enantioselective catalysis represents a versatile new method for the preparation of planar-chiral metacyclophanes.

Tetrahedron published new progress about Cyclotrimerization. 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Safety of (R)-2,2′-Bis(diphenylphosphino)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-binaphthyl.

Referemce:
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

Tanaka, Ken; Takahashi, Maho; Imase, Hidetomo; Osaka, Takuya; Noguchi, Keiichi; Hirano, Masao published the artcile< Enantioselective synthesis of α,α-disubstituted α-amino acids by Rh-catalyzed [2+2+2] cycloaddition of 1,6-diynes with protected dehydroamino acid>, Recommanded Product: (R)-2,2′-Bis(diphenylphosphino)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-binaphthyl, the main research area is enantioselective synthesis amino acid rhodium BINAP catalyst cycloaddition diyne; dehydroamino acid cycloaddition diyne catalyst rhodium BINAP.

We have determined that a cationic rhodium(I)/BINAP complex catalyzes a [2+2+2] cycloaddition of 1,6-diynes with protected dehydroamino acids, leading to protected α-amino acids bearing a quaternary carbon center in high yield with high enantioselectivity. Thus, aminoisoindolecarboxylate I (Ts = tosyl) was obtained in 96% yield and 97 ee by cycloaddition reaction of TsN(CH2CCMe)2 with AcNHC(:CH2)CO2Me using Rh(cod)2BF4/(R)-BINAP.

Tetrahedron published new progress about Alkadiynes Role: RCT (Reactant), RACT (Reactant or Reagent). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Recommanded Product: (R)-2,2′-Bis(diphenylphosphino)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-binaphthyl.

Referemce:
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

Burns, Alan R.; Lam, Hon Wai; Roy, Iain D. published the artcile< Enantioselective, rhodium-catalyzed 1,4-addition of organoboron reagents to electron-deficient alkenes>, Application of C44H40P2, the main research area is review enantioselective rhodium catalyzed organoboron addition electron deficient alkene.

A review. The enantioselective 1,4-addition of organometallic reagents to electron-deficient alkenes is one of the most important methods for carbon-carbon bond formation. Within this field, the rhodium-catalyzed 1,4-addition of organoboron reagents to electron-deficient alkenes occupies a prominent position owing to (1) the availability, stability, and functional group tolerance of organoboron reagents, (2) the wide range of acceptors that may be employed, (3) the ability of a broad range of structurally distinct families of chiral ligands to induce high enantioselectivities in the reactions, and (4) the usually mild and exptl. convenient conditions, which generally do not require any special precautions to exclude air or moisture.

Organic Reactions (Hoboken, NJ, United States) published new progress about 1,4-Addition reaction catalysts (stereoselective). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Application of C44H40P2.

Referemce:
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

Shintani, Ryo; Takagi, Chihiro; Ito, Tomoaki; Naito, Masanobu; Nozaki, Kyoko published the artcile< Rhodium-Catalyzed Asymmetric Synthesis of Silicon-Stereogenic Dibenzosiloles by Enantioselective [2+2+2] Cycloaddition>, Name: (R)-2,2′-Bis(diphenylphosphino)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-binaphthyl, the main research area is rhodium catalyzed asym synthesis silicon stereogenic dibenzosilole; enantioselective cycloaddition silyl prochiral triyne internal alkyne; germanium stereogenic dibenzogermole preparation; optical property dibenzosilole dibenzogermole; crystal mol structure alkynyl dibenzosilole; asymmetric catalysis; cycloaddition; dibenzosilole; rhodium; silicon.

A rhodium-catalyzed asym. synthesis of silicon-stereogenic dibenzosiloles has been developed through a [2+2+2] cycloaddition of silicon-containing prochiral triynes with internal alkynes. High yields and enantioselectivities have been achieved by employing an axially chiral monophosphine ligand, and the present catalysis is also applicable to the asym. synthesis of a germanium-stereogenic dibenzogermole. Preliminary studies on the optical properties of these compounds are also described.

Angewandte Chemie, International Edition published new progress about Alkynes, internal Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, Name: (R)-2,2′-Bis(diphenylphosphino)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-binaphthyl.

Referemce:
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

Okamoto, Ryuichi; Okazaki, Eri; Noguchi, Keiichi; Tanaka, Ken published the artcile< Rhodium-catalyzed olefin isomerization/enantioselective intramolecular Alder-ene reaction cascade>, HPLC of Formula: 139139-86-9, the main research area is dihydrobenzofuran dihydronaphthofuran derivative enantioselective synthesis; enyne olefin isomerization Alder ene reaction Rh chiral ligand.

The olefin isomerization/enantioselective intramol. Alder-ene reaction cascade was achieved by using a cationic rhodium(I)/(R)-BINAP complex as a catalyst. A variety of substituted dihydrobenzofurans e. g., I and dihydronaphthofurans e. g., II were obtained from phenol- or naphthol-linked 1,7-enynes, resp., with good yields and ee values.

Organic Letters published new progress about Alkenynes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 139139-86-9 belongs to class chiral-phosphine-ligands, and the molecular formula is C44H40P2, HPLC of Formula: 139139-86-9.

Referemce:
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