CpRuCl(PPh<sub>3</sub>)<sub>2</sub>-Catalyzed Cyclopropanation of Bicyclic Alkenes with Tertiary Propargylic Acetates
作者:Alphonse Tenaglia、Sylvain Marc
DOI:10.1021/jo060276a
日期:2006.4.1
The electron-rich cyclopentadienylruthenium complex CpRuCl(PPh3)2 turns out to be an efficient catalyst for the regio- and stereoselective cyclopropanation of bicyclic alkenes with tertiary propargylic carboxylates. The reaction provides 1,2,3-trisubstituted cyclopropanes in high yields as a single stereoisomer instead of the expected cyclobutenes via [2 + 2] cycloaddition. Functional groups such as
富电子的环戊二烯基钌络合物CpRuCl(PPh 3)2证明是具有叔炔丙基羧酸酯的双环烯烃的区域和立体选择性环丙烷化的有效催化剂。该反应以单一立体异构体的形式高收率地提供1,2,3-三取代的环丙烷,而不是通过[2 + 2]环加成反应生成的预期环丁烯。催化反应可耐受诸如醚,酯,醇,酚,酮,酯,羧酸酐,腈,卤化物,砜,酰亚胺,氨基甲酸酯和嗪等官能团。还证明了有效的环丁烯环丙烷化,提供了紧张的双环[2.1.0 1,3 ]戊烷骨架。