Optically active trivalent phosphorus compounds. 2. Reactivity of alkylthio- and alkylselenophosphonium salts. The first stereospecific synthesis of a chiral phosphinite
Stereospecific synthesis of diastereoisomerically pure (–)-(R<sub>p</sub>)-O-menthyl methylphenylphosphinite and ethylphenylphosphinite: key intermediates in synthesis of chiral tertiary phosphines
The reaction of the diastereoisomericallypure (–)-(RP)-O-menthylmethylphenylphosphinite (9) and (–)-(RP)-O-menthylethylphenylphosphinite (2) with organolithium reagents has been found to give chiraltertiaryphosphines (10) and (11) with a very high optical purity.
Enantioselective Deprotonation as a Vehicle for the Asymmetric Synthesis of C2-Symmetric P-Chiral Diphosphines
作者:Alexander R. Muci、Kevin R. Campos、David A. Evans
DOI:10.1021/ja00140a028
日期:1995.9
Communication is to disclose a convenient approach to the synthesis of Cz-symmetric P-chiral diphosphines4 that relies upon successive enantioselectivedeprotonation of aryldimethylphosphine-boranes or aryldimethylphosphine sulfides (eq 1) and subsequent oxidative coupling to the diphosphine precursors (eq 2) with high overall enantioselectivity (296%) for the two-step process.