A powerful new stereo-controlled method for epoxidation of electrophilic alkenes
作者:Carol Clark、Patricia Hermans、Otto Meth-Cohn、Clive Moore、Heinrich C. Taljaard、Gerda van Vuuren
DOI:10.1039/c39860001378
日期:——
tetrahydrofuran are shown to epoxidise α,β-unsaturated esters and sulphones efficiently in a stereo- and regio-specific manner, while esters of chiral alcohols undergo diastereofacially selective epoxidation.
Diastereoselective vinylogous directaldol reaction was realized by use of chiral α,β-unsaturated esters and aldehydes in the presence of aluminumtris[2,6-bis(4-alkylphenyl)phenoxide]s. The reaction involves novel 1,7-asymmetric induction and direct coupling of an α,β-unsaturated ester with an aldehyde, through in situ deprotonation of the γ-proton of the ester component by LTMP.