Asymmetric synthesis of chiral N-(1-methylbenzyl)aminophosphines
摘要:
The reactions of chlorophosphines 1 with (S)- or (R)-1-methylbenzylamines 2 proceed stereoselectively to give N-(1-methylbenzyl)aminophosphines 3, which were isolated as crystalline borane complexes with 100% diastereomeric purity. The absolute configuration of the new chiral compounds was established by X-ray analysis and chemical extrapolation. (C) 2003 Elsevier Science Ltd. All rights reserved.
A practical method for N-alkylation of phosphinic (thio)amides with alcohols via transfer hydrogenation
作者:Tanner C. Jankins、Zi-Yang Qin、Keary M. Engle
DOI:10.1016/j.tet.2019.04.029
日期:2019.6
This manuscript describes a modular method for preparing N-alkyl phosphinicamidesfrom primary or secondary alcohols and primary phosphinic amide (R1R2P = ONH2) nucleophiles via transfer hydrogenation. The transformation typically proceeds in excellent yields, employs conveniently available reagents, and produces water as the only byproduct.
该手稿描述了通过转移氢化从伯或仲醇和伯次膦酰胺(R 1 R 2 P = ONH 2)亲核试剂制备N-烷基次膦酰胺的模块化方法。该转化通常以优异的收率进行,使用方便获得的试剂,并且产生水作为唯一的副产物。
P-Chirogenic Diphosphazanes with Axially Chiral Substituents and Their Use in Rh-Catalyzed Asymmetric Hydrogenation
作者:Jan-Ole Moritz、Soumyadeep Chakrabortty、Bernd H. Müller、Anke Spannenberg、Paul C. J. Kamer
DOI:10.1021/acs.joc.0c01108
日期:2020.11.20
A convenient synthesis of enantiopure P-chirogenic diphosphazanes incorporating bulkybisphenol and 1,1′-bi-2-naphthol-derived substituents via the functionalization of a readily accessible enantiopure lithium phosphinoamide with chlorophosphoridites was developed. Since the product requires no subsequent deprotection, the protocol provides an easy, convenient synthesis of P-chirogenic ligands on the
Stereochemistry of electrophilic and nucleophilic substitution at phosphorus
作者:Oleg I. Kolodiazhnyi
DOI:10.1080/10426507.2018.1521409
日期:2019.5.27
Abstract Stereochemistry and mechanisms of nucleophilic [SN2(P)] and electrophilic [SE2(P)} reactions have been analyzed, discussed and confirmed by experimental studies. SE2(P) reactions proceed with the retention of absolute configuration, while the SN2(P) reactions react with the inversion of the configuration at the phosphorus atom. GRAPHICAL ABSTRACT
Stereoselective Reactions of Optically Active Derivatives of α-Methylbenzylaminophosphine
作者:O. I. Kolodyazhnyi、N. V. Andrushko、E. V. Grishkun
DOI:10.1023/b:rugc.0000031849.78207.1c
日期:2004.4
A number of N+(alpha-methylbenzyl) phosphorus amides were synthesized, and their stereochemical properties were studied. Reactions of achiral chlorophosphines with optically active alpha-methylbenzylamine are accompanied by asymmetric induction at the phosphorus atom to give optically active diastereoisomers of N-(alpha-methylbenzyl)aminophosphines, which were isolated as the corresponding borane complexes with 100% optical purity. Stereochemically pure (R,S)-aminophosphines were obtained by decomposition of these complexes via treatment with diethylamine. Their oxidation, sulfurization, and alkylation with methyl iodide afforded optically active aminophosphine derivatives. Hydrolysis of (R,S)-aminophosphines gave optically active tert-butylphenylphosphine oxide and phosphonic acid amides. (R,S)- and (S,S)-Diastereoisomers of N-(alpha-methylbenzyl)phosphinic amides were separated by crystallization and flash chromatography, and their absolute configuration was established. Also, derivatives of bis- and tris(alpha-methylbenzylamino)phosphines were synthesized.
Synthesis of Chiral tert-Butylphenylphosphine Oxide
作者:E. V. Grishkun、A. O. Kolodyazhnaya、O. I. Kolodyazhnyi