Synthesis of 1,4-Dihydropyridines and Related Heterocycles by Iodine-Mediated Annulation Reactions of <i>N</i>-Cyclopropyl Enamines
作者:Lanlan Wei、Manman Wang、Yifei Zhao、Yingchao Fang、Zongxiang Zhao、Biao Xia、Wenquan Yu、Junbiao Chang
DOI:10.1021/acs.orglett.1c03859
日期:2021.12.17
The annulation of N-cyclopropyl enamines to produce 1,4-dihydropyridine (1,4-DHP) derivatives is described. In the presence of molecular iodine (I2), an N-cyclopropyl enamine substrate undergoes iodination, opening of the cyclopropyl ring, and annulation with a second molecule of the substrate to form the 1,4-DHP product. This reaction is amenable to gram-scale operations under mild reaction conditions
描述了N-环丙基烯胺的环化以产生 1,4-二氢吡啶 (1,4-DHP) 衍生物。在分子碘(I 2 )存在下,N-环丙基烯胺底物经历碘化、环丙基环开环和与底物的第二分子环化以形成1,4-DHP产物。该反应可在温和的反应条件下进行克级操作,无需过渡金属。1,4-DHP 的进一步转化导致相关的吡啶和双环框架。