efficient enantioselective [4 + 2] cycloaddition of 2-amino-β-nitrostyrenes with cyclic N-sulfonyl ketimines has been developed. This reaction utilizes an organocatalytic approach, employing a multiple-hydrogen-bonding bifunctional squaramide-based catalyst. The process allows for the precise synthesis of chiral polycyclic benzosultams, showcasing intricate structures that incorporate chiral quaternary
开发了 2-
氨基-
β-硝基苯乙烯与环状N-磺酰基酮
亚胺的高效对映选择性 [4 + 2] 环加成反应。该反应采用有机催化方法,采用多
重氢键双功能方酰胺基催化剂。该过程可以精确合成手性多环苯并磺内酰胺,展示出包含手性四元中心的复杂结构。该方法值得注意的结果包括高产率以及优异的对映选择性和非对映选择性(高达 97% 的产率、96% ee 和 >20:1 dr)。