Allyl halides of different structures, under CO pressure, in the presence of Et3N, a catalytic amount of Pd(OAc)2, and triphenylphosphane as ligand, undergo a [2+2] cycloaddition reaction with various imines. The reaction is highly regio- and stereoselective: β-lactams are formed in good yields and with trans diastereoselectivity in both the β-lactam ring and the vinylic moiety. New and important information
不同结构的烯丙基卤在 CO 压力下,在 Et3N、催化量的 Pd(OAc)2 和作为
配体的
三苯基膦存在下,与各种
亚胺发生 [2+2] 环加成反应。该反应具有高度的区域选择性和立体选择性:β-内酰胺以良好的产率形成,并且在 β-内酰胺环和
乙烯基部分均具有反式非对映选择性。建议了关于已知反应机理的新的和重要的信息。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)