An amide‐thiourea compound, operating through a novel ion pairing mechanism, is an efficient organocatalyst for the asymmetric reaction of homophthalic anhydride with imines. N‐aryl and N‐alkyl imines readily undergo formal [4+2] cycloaddition to provide lactams with high levels of enantio‐ and diastereoselectivity. The nature of the key chiral ion pair intermediate was elucidated by DFT calculations
通过新颖的离子对机理运行的酰胺
硫脲化合物是一种高效的有机催化剂,用于高纯
邻苯二甲酸酐与
亚胺的不对称反应。N-芳基和N-烷基
亚胺易于进行正式的[4 + 2]环加成反应,从而为内酰胺提供高
水平的对映体和非对映体选择性。关键的手性离子对中间体的性质通过DFT计算得以阐明。