Reported herein is an unprecedented copper-catalyzed 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 synthon to prepare a seven-membered N-heterocycles.

中文翻译：

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未激活的C（sp3）-H键的远程定向异氰酸酯化：铜催化锻造七元环状尿素。

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。