Stereochemically controlled synthesis of unsaturated acids diphenylphosphinoyl (Ph2PO) -ketoacids
作者:Daniel Levin、Stuart Warren
DOI:10.1016/s0040-4039(00)61923-8
日期:1985.1
of cyclic anhydrides or oxidative cleavage of cyclic allyl phosphine oxides gives Ph2PO-ketoacids: reduction, separation of diastereoisomers, and completion of the Horner-Wittigreaction gives singleisomers () or () of unsaturatedacids.
Stereochemically pure E- and Z- alkenes by the Wittig–Horner reaction
作者:Antony D. Buss、Stuart Warren
DOI:10.1039/c3981000100b
日期:——
Pure Z-alkenes are obtained stereospecifically from erythro-alcohols (3) formed on addition of Ph2PO-stabilised anions to aldehydes; acylation of the same anions, reduction of the α-Ph2P(O) ketones (5) to the threo-alcohol (6), and elimination gives pure E-alkenes.