Uncatalyzed, Diastereoselective Vinylogous Mukaiyama Aldol Reactions on Aqueous Media: Pyrrole vs Furan 2-Silyloxy Dienes
作者:Claudio Curti、Lucia Battistini、Franca Zanardi、Gloria Rassu、Vincenzo Zambrano、Luigi Pinna、Giovanni Casiraghi
DOI:10.1021/jo101799e
日期:2010.12.17
diastereoselective vinylogous Mukaiyama aldol reaction is reported, between pyrrole/furan-based dienoxy silanes and aromatic aldehydes on salty water/methanol medium, at almost human body temperature, under ultrasonic irradiation. With pyrrole dienes the reaction is anti-selective, while that of furan dienes is syn-selective. The dual role of water as both reaction medium and promoter is highlighted.
据报道,在超声波辐射下,几乎在人体温度下,在咸水/甲醇介质中,吡咯/呋喃基二烯氧基硅烷与芳族醛之间发生了第一个未催化的非对映选择性乙烯基Mukaiyama aldol反应。对于吡咯二烯,反应是反选择性的,而呋喃二烯的反应是顺选择性的。强调了水作为反应介质和促进剂的双重作用。