Stereoselective synthesis, NMR conformational study and Diels-Alder reaction of β-functionalized 1-acetylvinyl arenecarboxylates
作者:Javier Peralta、Joseph P. Bullock、Roderick W. Bates、Simon Bott、Gerardo Zepeda、Joaquín Tamariz
DOI:10.1016/0040-4020(95)00140-4
日期:1995.4
A stereoselectivesynthesis of novel β-substituted 1-acetylvinylarenecarboxylates 2a–2h, via the bromo derivative 4a, is described. Isomer Z was the only product formed. Low temperature NMR experiments showed an s-cis/s-trans (20:80) conformeric equilibrium, and also a restricted rotational C-N barrier in 2a. X-ray diffraction of the latter revealed a planar s-trans conformation. Alkene 4a proved