Catalytic Ring Expansion of Cyclic Hemiaminals for the Synthesis of Medium‐Ring Lactams
作者:Wanxiang Zhao、Hui Qian、Zigang Li、Jianwei Sun
DOI:10.1002/anie.201504926
日期:2015.8.17
A mild and efficient intermolecular ring‐expansion approach was developed for the synthesis of medium‐ring lactams by using siloxy alkynes. Key to success is the suitable combination of a superior catalyst and an exceptional nitrogen‐protecting group. Control experiments indicated that the reaction is remarkably selective toward the desired lactam formation, even with many possible non‐productive pathways
开发了一种温和有效的分子间环扩环方法,用于通过使用甲硅烷氧基炔烃合成中环内酰胺。成功的关键是出色的催化剂和出色的氮保护基团的适当组合。对照实验表明,即使有许多可能的非生产性途径,该反应对所需的内酰胺形成也具有显着的选择性。