Day: December 30, 2022

Enantioselective Rhodium-Catalyzed Allylic C-H Activation for the Addition to Conjugated Dienes was written by Li, Qian;Yu, Zhi-Xiang. And the article was included in Angewandte Chemie, International Edition in 2011.Application In Synthesis of (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine This article mentions the following:

By applying the title transformation, two adjacent sp³ stereogenic centers, one of which is a quaternary carbon center, can be easily formed. This asym. reaction provides easy and efficient access to multifunctionalized tetrahydropyrrole, THF, and cyclopentane compounds 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: 252288-04-3Application In Synthesis of (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. At present, the synthesis of new chiral phosphines designed specifically for nucleophilic organocatalysis remains a significant challenge. Chiral phosphine catalysts: Nucleophilic phosphine catalysis often involves the formation of Lewis adducts, namely phosphonium (di)enolate zwitterions, as reaction intermediates.Application In Synthesis of (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Highly enantioselective transfer hydrogenation of α-imino esters by a phosphoric acid was written by Kang, Qiang;Zhao, Zhuo-An;You, Shu-Li. And the article was included in Advanced Synthesis & Catalysis in 2007.Quality Control of (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 acids have been identified as highly efficient organocatalysts for the asym. transfer hydrogenation of α-imino esters and amide. Utilizing Hantzsch esters as the hydrogen donor, versatile highly enantioenriched α-amino esters and their derivatives were obtained with up to 98% 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: 1043567-32-3Quality Control of (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. 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.Quality Control of (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

Asymmetric hydrogenation of diethyl 1-phenylvinylphosphonate by metal complexes in CH₂Cl₂ and in supercritical carbon dioxide using phosphite-type ligands was written by Ozolin, D. V.;Lyubimov, S. E.;Davankov, V. A.. And the article was included in Russian Chemical Bulletin in 2014.Application In Synthesis of (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine This article mentions the following:

Asym. hydrogenation of di-Et 1-phenylvinylphosphonate was carried out for the first time in dichloromethane and supercritical carbon dioxide in the presence of phosphite and amidophosphite ligands. The catalysts based on [Ir(COD)₂]BARF (COD is 1,5-cyclooctadiene, BARF is tetrakis[3,5-bis(trifluoromethyl)phenyl]borate anion), provide higher enantioselectivity than [Ir(COD)Cl]₂ and [Rh(COD)₂]BF₄. 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: 252288-04-3Application In Synthesis of (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. 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.Application In Synthesis of (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Asymmetric hydrosilylation of cyclohexa-1,3-diene with trichlorosilane by palladium catalysts coordinated with chiral phosphoramidite ligands was written by Park, Hoon Seo;Han, Jin Wook;Shintani, Ryo;Hayashi, Tamio. And the article was included in Tetrahedron: Asymmetry in 2013.Formula: C24H22NO2P This article mentions the following:

Chiral phosphoramidite ligands prepared from (S)-binaphthol and secondary amines were examined for the palladium-catalyzed asym. hydrosilylation of cyclohexa-1,3-diene with trichlorosilane. With a sterically demanding phosphoramidite bearing bis(diphenylmethyl)amine, the high enantiomeric excess of 87% was achieved, which is the highest enantioselectivity in the hydrosilylation of cyclohexadiene reported to date. The catalytic activity in the present hydrosilylation was high with all of the ligands employed, while the enantioselectivities varied dramatically depending on the dialkylamine moiety of the phosphoramidite ligand. 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: 252288-04-3Formula: 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. At present, the synthesis of new chiral phosphines designed specifically for nucleophilic organocatalysis remains a significant challenge. Indeed, very little research on chiral tertiary phosphine-catalyzed asymmetric reactions occurred prior to the year 2000.Formula: C24H22NO2P

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

High Efficiency and Enantioselectivity in the Rh-Catalyzed Conjugate Addition of Arylboronic Acids Using Monodentate Phosphoramidites was written by Boiteau, Jean-Guy;Minnaard, Adriaan J.;Feringa, Ben L.. And the article was included in Journal of Organic Chemistry in 2003.Related Products of 252288-04-3 This article mentions the following:

A very fast reaction rates and high enantioselectivities were reached in the rhodium-catalyzed arylboronic acid addition to cyclic enones using a monodentate phosphoramidite ligand. Monodentate N,N-R₂-phosphoramidous esters of (S)-1,1′-binaphthyl-2,2′-diol and (S)-octahydro-1,1′-binaphthyl-2,2′-diol (L1-L4) were prepared by reaction of corresponding diol with PCl₃ followed by amination with NHR₂ (R = Me, Et). Asym. conjugate addition of arylboronic acids ArB(OH)₂ (Ar = Ph, 2-FC₆H₄, 3-MeOC₆H₄, 3-MeC₆H₄ 4-MeC₆H₄) to 2-cyclohexenone, 2-cyclopentanone, 2-cycloheptenone and 5,6-dihydro-2-pyranone in the presence of Rh(acac)(C₂H₄)₂/L4 (mol. ratio 1:2.5) gave corresponding 3-arylcycloalkanones and 4-phenyltetrahydro-2-pyranone with ee values > 96% (L4 = (S)-octahydro-1,1′-binaphthyl-2,2′-diyl N,N-diethylphosphoramidite). Temperature-dependent studies show that monodentate phosphoramidites form stable complexes with metals and can induce high enantioselectivities even at elevated temperatures in polar solvents. 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: 252288-04-3Related Products of 252288-04-3).

(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. 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. Over the last decade, however, and especially since 2005, considerable progress has been made in asymmetric phosphine catalysis.Related Products of 252288-04-3

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Synthesis of chiral phosphorus reagents and their catalytic activity in asymmetric borane reduction of N-phenylimine of acetophenone was written by Li, Kangying;Zhou, Zhenghong;Zhao, Guofeng;Tang, Chuchi. And the article was included in Heteroatom Chemistry in 2003.Safety of (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine This article mentions the following:

Eleven chiral trivalent or quadrivalent phosphorus reagents were synthesized starting from L-proline, D-camphor, (+)- or (-)-1,1′-binaphthalene-2,2′-diol, (-)-α-phenylethylamine, etc. and their application as catalysts in asym. borane reduction of PhMeC:NPh was investigated. PhMeCHNHPh was obtained in good yield with low to moderate enantioselectivity. 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: 252288-04-3Safety of (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.Safety of (11bS)-N,N-Diethyldinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Enantioselective synthesis of unsymmetrical triarylmethanes by chiral Bronsted acids was written by Sun, Feng-Lai;Zheng, Xiao-Jian;Gu, Qing;He, Qing-Li;You, Shu-Li. And the article was included in European Journal of Organic Chemistry in 2010.Safety of (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 Bronsted acid catalyzed Friedel-Crafts alkylation of electron-rich arenes with (3-indolyl)methanamines has been realized to provide an efficient synthesis of enantioenriched unsym. triarylmethanes. With 5 mol-% of a newly developed chiral phosphoric acid, the enantioenriched unsym. triarylmethanes were obtained in excellent yields with up to 91 % 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: 1043567-32-3Safety of (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. 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. Indeed, very little research on chiral tertiary phosphine-catalyzed asymmetric reactions occurred prior to the year 2000.Safety of (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

First rhodium/phosphoramidite complex-catalyzed enantioselective isomerization of allylic alcohols into aldehydes was written by Boeda, Fabien;Mosset, Paul;Crevisy, Christophe. And the article was included in Tetrahedron Letters in 2006.Electric Literature of C24H22NO2P This article mentions the following:

Primary allylic alcs. are converted into chiral aldehydes in the presence of a catalytic amount (7 mol %) of a monodentate phosphoramidite rhodium catalyst. The aldehydes are isolated in high yields (84-89%) and moderate to good ee’s (38-70%). A preliminary mechanistic study showed that the reaction proceeds through a 1,3-H migration pathway. 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: 252288-04-3Electric Literature 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.Electric Literature of C24H22NO2P

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Enantioselective Hydrophosphonylation of in Situ Generated N-Acyl Ketimines Catalyzed by BINOL-Derived Phosphoric Acid was written by Suneja, Arun;Unhale, Rajshekhar A.;Singh, Vinod K.. And the article was included in Organic Letters in 2017.Reference of 1043567-32-3 This article mentions the following:

An efficient route to pharmacol. interesting isoindolinone-based α-amino phosphonates is described via asym. hydrophosphonylation of in situ generated ketimines catalyzed by BINOL-derived phosphoric acid. The reaction proceeds smoothly at ambient temperature affording a variety of α-amino phosphonates with a quaternary stereogenic center embedded in isoindolinone motif in high yields with excellent enantiomeric ratios (up to 98.5:1.5 er). Several interesting transformations of the products into valuable synthetic intermediates are also depicted. 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: 1043567-32-3Reference 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. Over the last decade, however, and especially since 2005, considerable progress has been made in asymmetric phosphine catalysis.Reference of 1043567-32-3

Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis

Acid-promoted formal [3+2] cyclization/N,O-ketalization of in-situ generated ortho-alkynyl quinone methides: access to bridged 2,3-cyclopentanoindoline skeletons was written by Wang, Ruo-Nan;Ma, Yan-Hua;Su, Qing-Qiang;Fan, Ya-Xin;Lv, Yong-Zheng;Zhang, Xiang-Zhi;Wang, Yan-Lan;Huang, Hong-Li;Du, Ji-Yuan. And the article was included in Organic Chemistry Frontiers in 2022.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:

An acid-catalyzed formal [3+2] cyclization/N,O-ketalization of in-situ formed ortho-alkynyl quinone methides (o-AQMs) and tryptophol derivatives was developed. With this method, a series of functionalized 2,3-cyclopentanoindoline derivatives were effectively synthesized in good yields with excellent diastereoselectivities under mild conditions. In this reaction, o-AQMs formally serves as synthetic equivalent of the 1,3-dipole, and the process involves a tandem 1,4-addition/dearomatization/1,2-shift/aromatization sequence of tryptophol. 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. 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. Trivalent phosphorus compounds called phosphines have a tetrahedral electron-group geometry which makes them structurally analogous to amines.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