N-heterocyclic carbene (NHC)-catalyzed enantioselective [3 + 3] annulation of 2-bromoenals with 2-amino-1H-indoles has been developed. A series of functionalized 2-aryl-2,3-dihydropyrimido[1,2-a]indol-4(1H)-ones were synthesized using NHCs as the catalyst in good yields with high to excellent enantioselectivities.
开发了一种高效的 N-杂环卡宾 (NHC) 催化的 2-
溴烯醛与 2-
氨基-1 H-
吲哚的对映选择性 [3 + 3] 成环反应。使用NHCs作为
催化剂合成了一系列功能化的2-芳基-2,3-二
氢嘧啶基[1,2- a ]
吲哚-4(1H ) -
酮,收率良好,具有高至优异的对映选择性。