Highly Diastereo- and Enantioselective Pd-Catalyzed Cyclopropanation of Acyclic Amides with Substituted Allyl Carbonates
作者:Wei Liu、Di Chen、Xia-Zhen Zhu、Xiao-Long Wan、Xue-Long Hou
DOI:10.1021/ja902410w
日期:2009.7.1
A highly diastereo- and enantioselective cyclopropanation reaction was realized in the reaction of acyclic amides with monosubstituted allyl carbonates via Pd-catalysis using a ferrocene ligand with H as a substituent on an oxazoline ring, providing cyclopropane products having three chiral centers in yields of 67-83%, the dr ratio being 4-23:1, and ee being 83-97%. The presence of LiCl is important
在无环酰胺与单取代的碳酸烯丙酯通过 Pd 催化反应中实现了高度非对映选择性和对映选择性环丙烷化反应,使用二茂铁配体,H 作为恶唑啉环上的取代基,提供具有三个手性中心的环丙烷产物,产率为 67- 83%,dr比为4-23:1,ee为83-97%。LiCl 的存在对于获得反应的高非对映选择性和对映选择性很重要。