The catalytic asymmetricsynthesis of P-chiral phosphorus compounds is an important way to construct P-chiral ligands. Herein, we report a new strategy that adopts the pyridinyl moiety as the coordinating group in the cobalt-catalysed asymmetric nucleophilic addition/alkylation of secondary phosphine oxides (SPOs). A series of tertiary phosphine oxides (TPOs) were generated with up to 99 % yield and
5-disubstituted-α-D-glucofuranose proceeds with very high stereoselectivity to give stereochemically pure phosphinic and phosphinous acid esters, which are starting reagents for preparation of chiral organophosphoruscompounds. Stereoselectivity of the reaction depends on the nature of bases, solvent, temperature and excess of chlorophosphine.
Ni-Catalyzed Enantioselective Benzylation of Secondary Phosphine Oxide
作者:Wen-Qiang Cai、Qi Wei、Qing-Wei Zhang
DOI:10.1021/acs.orglett.2c00209
日期:2022.2.11
A nickel-catalyzed benzylic substitution of secondaryphosphineoxide was described, affording the dialkylated P-stereogenic tertiary phosphineoxides with high to excellent enantioselectivities. The reaction was performed under mild conditions with commercially available benzyl chlorides and bench stable secondaryphosphineoxides, exhibiting broad functional group tolerance. It represented a practical
PREPARATION OF OPTICALLY ACTIVE PHOSPHINE OXIDES BY REGIOSELECTIVE CLEAVAGE OF CYCLIC PHENYLPHOSPHONITE WITH ALKYL HALIDES
作者:Masahito Segi、Yoshiyuki Nakamura、Tadashi Nakajima、Sohei Suga
DOI:10.1246/cl.1983.913
日期:1983.6.5
4S)-4-methyl-2-phenyl-1,3,2-dioxaphosphorinane with various alkyl halides gave the diastereomerically pure phosphinates with regioselective cleavage of the primary carbon–oxygen bond. These phosphinates reacted with Grignard reagents to give optically active phosphine oxides in high optical yields.
Stereospecific reduction of diastereomerically pure menthyl phosphinates: a new route to optically active phosphine oxides
作者:Yasuhiro Koide、Atsushi Sakamoto、Tsuneo Imamoto
DOI:10.1016/s0040-4039(00)92710-2
日期:1991.7
Diastereomerically pure menthyl phosphinates are stereospecifically reduced by lithium, 4,4′-di-tert-butylbiphenylide. Subsequent treatment with alkyl halides affords phosphine oxides with high optical purity.