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
Efficient synthesis of functionalized olefins by Wittig reaction using Amberlite resin as a mild base
作者:Tushar R. Valkute、Eswar K. Aratikatla、Asish K. Bhattacharya
DOI:10.1080/00397911.2016.1276191
日期:2017.3.19
convenient procedure for the synthesis of olefins by the reaction of stabilized, semistabilized, and nonstabilized phosphorous ylides with various aldehydes or ketone using Amberlite resin as a mild base is described. Our developed method offers facile and racemization-free synthesis of α,β-unsaturated amino esters and chiral allylic amine. The developed methodology offers mild reaction conditions, high efficiency