Silicon tetrachloride in organic synthesis: new applications for the vinylogous aldol reaction
作者:Maria R. Acocella、Margherita De Rosa、Antonio Massa、Laura Palombi、Rosaria Villano、Arrigo Scettri
DOI:10.1016/j.tet.2005.02.020
日期:2005.4
efficient methodology for vinylogous aldol reactions based on SiCl4 catalysis. According to the nucleophilicity Mayr's scale, vinylogous aldol reaction of Chan's diene proved to be effective by using catalytic amount of SiCl4, without any other promoter. On the contrary, the SiCl4/Lewis base system has been conveniently exploited for the efficient and selective vinylogous reaction of less nucleophilic
本文介绍了一种基于SiCl 4催化的乙烯基醇醛醇缩醛反应的新颖而有效的方法。根据亲核性迈尔(Mayr)规模,通过使用催化量的SiCl 4而不使用任何其他助催化剂,证明了陈氏二烯的乙烯基醇醛醇缩醛反应是有效的。相反,SiCl 4 / Lewis碱系统已被方便地用于较少亲核的Danishefsky's二烯和2-三甲基甲硅烷基氧基呋喃(TMSOF)的高效选择性乙烯基反应。实际上,许多路易斯碱(例如亚砜,甲酰胺和磷酰胺)已成功用作SiCl 4发起人。由2,2,6-三甲基-[1,3]-二恶英-4-酮衍生物衍生而来的TMSOF和甲硅烷基氧二烯需要化学计量的SiCl 4,而Chan和Danishefsky的二烯的乙烯基醇醛缩合反应在存在催化或亚化学计量的催化剂。