Month: December 2022

Organocatalytic synthesis of α-quaternary amino acid derivatives via aza-Friedel-Crafts alkylation of indoles with simple α-amidoacrylates was written by Righi, Marika;Bartoccini, Francesca;Lucarini, Simone;Piersanti, Giovanni. And the article was included in Tetrahedron in 2011.Electric Literature of C48H29O4P This article mentions the following:

The first (organo)catalytic method for regio- and chemoselective aza-Friedel-Crafts (FC) alkylation of indoles and pyrroles with com. available Me α-acetamidoacrylates has been discovered. It minimizes/eliminates common competing reactions that occur due to the high and multiatom-nucleophilic character of indole and pyrrole. Diverse quaternary α-amino acids were successfully prepared in good yield and high selectivity using low catalyst loading. The enantioselective variant using BINOL-derived phosphoric acids was also explored with indole providing the desired FC alkylation product with moderate enantioselectivities. In the experiment, the researchers used many compounds, for example, (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3Electric Literature of C48H29O4P).

(11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3) belongs to chiral phosphine ligands. Although many reactions require more nucleophilic trialkylphosphines as catalysts, only a few chiral trialkylphosphines are available. Over the last decade, however, and especially since 2005, considerable progress has been made in asymmetric phosphine catalysis.Electric Literature of C48H29O4P

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Platinum(II) Catalyzed Enantioselective Cycloisomerizations of 3-Hydroxylated 1,5-Enynes was written by Zhang, Yang;Jullien, Helene;Brissy, Delphine;Retailleau, Pascal;Voituriez, Arnaud;Marinetti, Angela. And the article was included in ChemCatChem in 2013.Computed Properties of C24H22NO2P This article mentions the following:

The enantioselective cycloisomerization of 3-hydroxylated 1,5-enynes into bicyclo[3.1.0]hexanones was investigated by using cyclometalated NHC-platinum phosphoramidite complexes as precatalysts. Several new complexes were prepared They generate cationic, electrophilic Pt^II species that efficiently promote the cycloisomerization process. Enantiomeric excesses up to 81% were obtained in the reactions of enynes with aryl-substituted alkyne functions (8 examples, 70-81% ee). In the experiment, the researchers used many compounds, for example, (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3Computed Properties of C24H22NO2P).

(11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3) belongs to chiral phosphine ligands. Although many reactions require more nucleophilic trialkylphosphines as catalysts, only a few chiral trialkylphosphines are available. Indeed, very little research on chiral tertiary phosphine-catalyzed asymmetric reactions occurred prior to the year 2000.Computed Properties of C24H22NO2P

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Catalytic Asymmetric Dearomatization of Indolyl Dihydropyridines through an Enamine Isomerization/Spirocyclization/Transfer Hydrogenation Sequence was written by Xia, Zi-Lei;Zheng, Chao;Wang, Shou-Guo;You, Shu-Li. And the article was included in Angewandte Chemie, International Edition in 2018.SDS of cas: 1043567-32-3 This article mentions the following:

A highly efficient synthesis of enantioenriched spiroindolines, e. g., I, by catalytic asym. dearomatization of indolyl dihydropyridines through a chiral phosphoric acid catalyzed enamine isomerization/spirocyclization/transfer hydrogenation sequence has been developed. This reaction proceeds under mild reaction conditions, affording novel spiroindolines in good yields (up to 88 %) with excellent enantioselectivity (up to 97 % ee). DFT calculations provide insights into the reaction mechanism as well as the origin of stereochem. In the experiment, the researchers used many compounds, for example, (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3SDS of cas: 1043567-32-3).

(11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3) belongs to chiral phosphine ligands. The synthesis of novel trialkylphosphines can be quite difficult, thereby limiting the scope of their chiral variants. Trivalent phosphorus compounds called phosphines have a tetrahedral electron-group geometry which makes them structurally analogous to amines.SDS of cas: 1043567-32-3

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

The long-arm effect: influence of axially chiral phosphoramidite ligands on the diastereo- and enantioselectivity of the tandem 1,4-addition/fluorination was written by Wang, Lian;Meng, Wei;Zhu, Chuan-Le;Zheng, Yan;Nie, Jing;Ma, Jun-An. And the article was included in Angewandte Chemie, International Edition in 2011.Name: (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine This article mentions the following:

Alkylidene-substituted β-aryl β-ketoesters undergo asym. tandem Michael addition and electrophilic fluorination in reaction with dialkylzinc compounds and N-fluorobenzenesulfonimide, catalyzed by copper(II) triflate, modified with axial chiral 1,1′-binaphthalene 2,2′-phosphoramidite monodentate ligands QO₂PNR³₂ (1a–r, Q = 3,3′-diaryl-1,1′-binaphthalene-2,2-diyl, R³ = Me, Et, ⁱPr, Bu), yielding α-fluoro-β-ketoesters I (3a–v, R = H, 4-MeO, 3-Me, 2-Me, 4-Cl, 4-Br; R¹ = Et, Me, n-Pr, Bu; R² = Ph, 2-MeOC₆H₄, 3-MeOC₆H₄, 4-MeOC₆H₄, 4-CF₃C₆H₄, 2-naphthyl, 2-furyl, 2-thienyl)with high yields and >85% ee. The variety of 3,3′-disubstituted chiral phosphoramidites were evaluated, the 4-biphenylyl and 4-(2-naphthyl)phenyl substituents provided optimal chiral induction, 75-90%. N-Substituents of the phosphoramidites 1 play a minor role in induction, the diethylamino group as NR³₂ being optimal. In the experiment, the researchers used many compounds, for example, (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3Name: (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine).

(11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3) belongs to chiral phosphine ligands. Thousands of arylphosphines have been used as chiral ligands for metal-catalyzed asymmetric reactions. Chiral phosphine catalysts: Nucleophilic phosphine catalysis often involves the formation of Lewis adducts, namely phosphonium (di)enolate zwitterions, as reaction intermediates.Name: (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Rhodium-catalyzed asymmetric addition of aryl- and alkenylboronic acids to isatins was written by Shintani, Ryo;Inoue, Mitsunori;Hayashi, Tamio. And the article was included in Angewandte Chemie, International Edition in 2006.COA of Formula: C24H22NO2P This article mentions the following:

A rhodium-catalyzed asym. addition of arylboronic acids to isatins has been developed to produce biol. relevant 3-aryl-3-hydroxy-2-oxindoles in high yield (mopping up rhodium). The most efficient catalyst discovered in this study was (R)-MeO-mop [i.e., [(1R)-2′-methoxy[1,1′-binaphthalen]-2-yl]diphenylphosphine, (R)=(+)-MOP]. High enantioselectivity was observed with (R)-MeO-mop as a ligand, and the reaction could be extended to the addition of alkenyl groups. In the experiment, the researchers used many compounds, for example, (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3COA of Formula: C24H22NO2P).

(11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3) belongs to chiral phosphine ligands. The synthesis of novel trialkylphosphines can be quite difficult, thereby limiting the scope of their chiral variants. Chiral ligands coordinate to metal centers to create an asymmetric environment around the reaction centers, which eventually affects enantioselectivity and reaction rate.COA of Formula: C24H22NO2P

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Biomimetic Asymmetric Hydrogenation: In Situ Regenerable Hantzsch Esters for Asymmetric Hydrogenation of Benzoxazinones was written by Chen, Qing-An;Chen, Mu-Wang;Yu, Chang-Bin;Shi, Lei;Wang, Duo-Sheng;Yang, Yan;Zhou, Yong-Gui. And the article was included in Journal of the American Chemical Society in 2011.Application of 1043567-32-3 This article mentions the following:

In the presence of [Ru(p-cymene)I₂]₂ and the nonracemic binaphthyldiol phosphoric acid I, Hantzsch ester II was used in catalytic amounts with hydrogen as the stoichiometric reductant for the enantioselective transfer hydrogenation of arylbenzoxazinones III (R = Ph, 4-MeOC₆H₄, 4-MeC₆H₄, 3,4-Me₂C₆H₃, 4-ClC₆H₄, 4-BrC₆H₄, 4-FC₆H₄, 3-FC₆H₄, 2-thienyl; R¹ = H, Cl, Me, Me₃C; R² = H, Me) to give the corresponding aryldihydrobenzoxazinones IV (R = Ph, 4-MeOC₆H₄, 4-MeC₆H₄, 3,4-Me₂C₆H₃, 4-ClC₆H₄, 4-BrC₆H₄, 4-FC₆H₄, 3-FC₆H₄, 2-thienyl; R¹ = H, Cl, Me, Me₃C; R² = H, Me) in 59-98% yields and in 92-99% ee. In the experiment, the researchers used many compounds, for example, (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3Application of 1043567-32-3).

(11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3) belongs to chiral phosphine ligands. Phosphine-catalyzed asymmetric reactions are now powerful and versatile tools for the construction of C–C, C–N, C–O, and C–S bonds and for the syntheses of functionalized carbocycles and heterocycles. Most of these phosphines are acyclic, usually possess low nucleophilic activity, and generally display poor enantioselectivities for phosphine organocatalysis. Application of 1043567-32-3

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Organocatalytic Enantioselective Construction of Axially Chiral Tetrasubstituted Allenes via 1,6-Addition of Alkynyl Indole Imine Methides with 2-Substituted Indoles was written by Wu, Yu;Yue, Zhibin;Qian, Chenxiao;Chen, Xuling;Li, Fushuai;Li, Pengfei;Li, Wenjun. And the article was included in Asian Journal of Organic Chemistry in 2022.HPLC of Formula: 1043567-32-3 This article mentions the following:

An organocatalytic construction of axially chiral tetrasubstituted allenes I [R¹ = H, 5-F, 6-OMe, etc.; R² = H, F, Cl, Br; R³ = Me, t-Bu, Ph, etc.; R⁴ = Et, i-Pr, t-Bu, Bn; Ar¹ = Ph, 4-FC₆H₄, 3-FC₆H₄, 3-MeC₆H₄] featuring indole skeletons was established. With the aid of chiral phosphoric acid, alkynyl indole imine methides were formed in situ from α-(3-indolyl) propargylic alcs., followed by the asym. 1,6-conjugate addition with 2-substituted indoles, furnishing axially chiral indole-containing tetrasubstituted allenes in generally high yields and enantioselectivities. In the experiment, the researchers used many compounds, for example, (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3HPLC of Formula: 1043567-32-3).

(11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3) belongs to chiral phosphine ligands. Many phosphine-catalyzed reactions have been developed for the syntheses of various biologically important acyclic and cyclic molecules. Asymmetric variants of these reactions have evolved relatively slowly. Asymmetric catalytic performance is determined not only by the metal center but also by the chiral ligand selected.HPLC of Formula: 1043567-32-3

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Catalytic asymmetric induction of planar chirality: palladium catalyzed intramolecular Mizoroki-Heck reaction of prochiral (arene)chromium complexes was written by Kamikawa, Ken;Harada, Kenji;Uemura, Motokazu. And the article was included in Tetrahedron: Asymmetry in 2005.Category: chiral-phosphine-ligands This article mentions the following:

The asym. intramol. Mizoroki-Heck reaction of prochiral tricarbonyl(2,6-dibutenylchlorobenzene)chromium in the presence of a chiral phosphine-palladium catalyst gave the corresponding bicyclic chromium complex up to 73% ee. In the experiment, the researchers used many compounds, for example, (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3Category: chiral-phosphine-ligands).

(11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine (cas: 252288-04-3) belongs to chiral phosphine ligands. Generally, the efficiency of nucleophilic phosphine catalysis often depends on the nature of the tertiary phosphine. Indeed, very little research on chiral tertiary phosphine-catalyzed asymmetric reactions occurred prior to the year 2000.Category: chiral-phosphine-ligands

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Dual Catalysis in Highly Enantioselective Multicomponent Reaction with Water: An Efficient Approach to Chiral β-Amino-α-Hydroxy Acid Derivatives was written by Qian, Yu;Jing, Changcheng;Shi, Taoda;Ji, Jingjing;Tang, Min;Zhou, Jing;Zhai, Changwei;Hu, Wenhao. And the article was included in ChemCatChem in 2011.Computed Properties of C48H29O4P This article mentions the following:

A method for the stereoselective preparation of chiral amino hydroxy benzenepropanoate derivatives was designed and the synthesis of the target compounds was achieved in good diastereoselectivity and high enantioselectivity by an enantioselective three-component reaction of diazo compounds with imines and water in the presence of dirhodium tetraacetate [Rh₂(Ac)₄] and a chiral Bronsted acid [4-(hydroxy)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin 4-oxide derivatives]. This reaction represents one of a few catalytic asym. procedures using water as a reactant and provides and efficient method for the synthesis of chiral β-amino α-hydroxy acid derivatives from readily available starting materials under mild reaction conditions. The title compounds thus prepared included threo-α-hydroxy-β-[(4-methoxyphenyl)amino]-α-(phenyl)benzenepropanoic acid esters. In the experiment, the researchers used many compounds, for example, (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3Computed Properties of C48H29O4P).

(11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3) belongs to chiral phosphine ligands. During the past two decades, tertiary phosphine catalysts have been applied extensively in a wide range of carbon–carbon and carbon–heteroatom bond-forming transformations. Chiral phosphine catalysts: Nucleophilic phosphine catalysis often involves the formation of Lewis adducts, namely phosphonium (di)enolate zwitterions, as reaction intermediates.Computed Properties of C48H29O4P

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Enantioselective synthesis of benzofurans and benzoxazines via an olefin cross-metathesis-intramolecular oxo-Michael reaction was written by Zhang, Jun-Wei;Cai, Quan;Gu, Qing;Shi, Xiao-Xin;You, Shu-Li. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2013.Recommanded Product: (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide This article mentions the following:

Chiral phosphoric acid and Hoveyda-Grubbs II were found to catalyze an olefin cross-metathesis-intramol. oxo-Michael cascade reaction of the ortho-allylphenols and enones to provide a variety of benzofuran and benzoxazine derivatives in moderate to good yields and enantioselectivity. In the experiment, the researchers used many compounds, for example, (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3Recommanded Product: (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide).

(11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3) belongs to chiral phosphine ligands. The synthesis of novel trialkylphosphines can be quite difficult, thereby limiting the scope of their chiral variants. Over the last decade, however, and especially since 2005, considerable progress has been made in asymmetric phosphine catalysis.Recommanded Product: (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis