Dienamine Activation in the Organocatalytic Asymmetric Synthesis of cis-3,4-Difunctionalized Chromans and Dihydrocoumarins
作者:Dieter Enders、Xuena Yang、Chuan Wang、Gerhard Raabe、Jan Runsik
DOI:10.1002/asia.201100320
日期:2011.9.5
Dienamine activation wins against oxa‐1,4/1,4: By using nitrovinyl phenols and enals, aminocatalysis allows the asymmetric synthesis of chromans and dihydrocoumarins bearing a CC double bond at the 3‐position (see scheme; TMS=trimethylsilyl). The new protocol takes advantage of the dienamine reactivity of the enal and avoids the known oxa‐Michael/Michael sequence.
氨醇二烯胺活化胜利反对氧杂-1,4- / 1,4-:通过使用硝基乙烯基酚和enals,aminocatalysis允许苯并二氢吡喃和二氢香豆素轴承C的不对称合成在3-位C双键(参见方案; TMS =三甲基硅烷基) 。新方案利用了烯醛的二烯胺反应性,并避免了已知的oxa-Michael / Michael序列。