申请人:Pereira David E.
公开号:US20070270593A1
公开(公告)日:2007-11-22
Chiral ruthenium catalysts comprising salen and alkenyl ligands are provided for stereoselective cyclopropanation, and methods of cyclopropanation are provided. The chiral ruthenium catalyst is prepared in situ by combining an alkenyl ligand, a deprotonated chiral salen ligand, and a ruthenium (II) metal. A preferred catalyst is prepared in situ by combining 2,3-dihydro-4-venylbenzofuran, deprotonated 1,2-cyclohexanediamino-N,N′-bis(3,5-di-t-butyl-salicylidene) and RuCl
2
(p-cymene)]
2
.
提供了由salen和alkenyl配体组成的手性钌催化剂,用于立体选择性环氧化反应,并提供了环氧化反应的方法。该手性钌催化剂通过将alkenyl配体、去质子化的手性salen配体和钌(II)金属组合而成。一种首选的催化剂是通过将2,3-二氢-4-乙烯基苯并呋喃、去质子化的1,2-环己二胺-N,N′-双(3,5-二叔丁基水杨醛亚胺)和RuCl2(p-甲基环辛烷)]2组合而成的。