Remote Directed Isocyanation of Unactivated C(sp<sup>3</sup>)–H Bonds: Forging Seven-Membered Cyclic Ureas Enabled by Copper Catalysis
作者:Hongwei Zhang、Peiyuan Tian、Lishuang Ma、Yulu Zhou、Cuiyu Jiang、Xufeng Lin、Xiao Xiao
DOI:10.1021/acs.orglett.9b04542
日期:2020.2.7
site-selective δ-C(sp3)-H bonds activation of aliphatic sulfonamides for constructing the synthetically useful seven-membered N-heterocycles. A key to success is the use of in-situ-formed amide radicals, to activate the inert C(sp3)-H bond, and inexpensive TMSNCO, as a coupling reagent under mild conditions. To the best of our knowledge, this represents the first use of alkylamine derivatives as a five-membered
本文报道的是前所未有的铜催化脂族磺酰胺的位点选择性δ-C(sp3)-H键活化,用于构建合成上有用的七元N-杂环。成功的关键是在温和的条件下使用原位形成的酰胺基团激活惰性C(sp3)-H键和廉价的TMSNCO,作为偶联剂。据我们所知,这是首次使用烷基胺衍生物作为五元合成子来制备七元N-杂环。