Stereoselective Mannich reaction catalyzed by tetrahydroindolo[3,2-b]indole under solvent-free conditions
作者:Jing Shi、Li-Zhu Zhang、Yong Pan、Deng-Qiang Feng、Guang-Yu Wu、Ke Yang、Xiao-Qiang Sun、Zheng-Yi Li
DOI:10.1016/j.tetlet.2022.154128
日期:2022.10
have been designed and synthesized for the three-component direct Mannich reaction of aromatic aldehydes and aromatic amines with ketones. Significantly, the organocatalyst 2a delivered excellent catalytic stereoselectivity (up to >99:1) with good yields (up to 88 %) for above reaction process under the solvent-free conditions at room temperature. X-ray diffraction analysis reveals that organocatalyst
一系列基于吲哚的有机催化剂(4b,9b-aryl-4b,5,9b,10-tetrahydroindolo[3,2- b ]indole 衍生物)(2a-2f)已被设计和合成用于三组分直接曼尼希芳香醛和芳香胺与酮的反应。值得注意的是,有机催化剂2a在室温和无溶剂条件下为上述反应过程提供了优异的催化立体选择性(高达 >99:1)和良好的收率(高达 88%)。X 射线衍射分析表明,有机催化剂2a具有八元中心环结构,具有有趣的应变四环连接性。2a中包含的特征刚性V形吲哚环结构并且2a和中间体之间形成的氢键相互作用优于抗立体选择性产物。