α-Chloro-β,γ-ethylenic Esters: Enantiocontrolled Synthesis and Substitutions
作者:Douglas T. Genna、Christopher P. Hencken、Maxime A. Siegler、Gary H. Posner
DOI:10.1021/ol102142a
日期:2010.10.15
γ-seleno-α,β-ethylenic esters, when treated with sulfuryl chloride and ethyl vinyl ether in hexanes, produced α-chloro-β,γ-ethylenic esters in 65−75% yields, with ee values of 95−97%, and with 1,3-syn transfer of chirality. Reaction of these allylic chloride electrophiles with methylcuprate and with sodium azide nucleophiles afforded exclusively γ-substituted-α,β-ethylenic esters with faithful anti-transfer