Catalytic Enantioselective Synthesis of Lactams through Formal [4+2] Cycloaddition of Imines with Homophthalic Anhydride
作者:Claire L. Jarvis、Jennifer S. Hirschi、Mathew J. Vetticatt、Daniel Seidel
DOI:10.1002/anie.201612148
日期:2017.3.1
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。