Copper‐Catalyzed Chan‐Lam Reaction and Sequential [2,3]‐Rearrangement to Prepare α‐Benzotriazinium Ketones

Abstract A variety of α‐benzotriazinium ketones were prepared in 38%–89% yields through a copper(II)‐catalyzed Chan‐Lam reaction and [2,3]‐rearrangement in a one pot reaction open to air from N ‐hydroxybenzotriazin‐4‐ones and alkenyl boronic acids at room temperature. Experimental results showed tha...

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Published inAdvanced synthesis & catalysis
Main Authors Gao, Jia‐Yi, Wei, Meng‐Yan, Wei, Xian‐Jun, Bi, Hong‐Yan, Liang, Cui, Chen, Chun‐Hua, Mo, Dong‐Liang
Format Journal Article
LanguageEnglish
Published 20.09.2024
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Summary:Abstract A variety of α‐benzotriazinium ketones were prepared in 38%–89% yields through a copper(II)‐catalyzed Chan‐Lam reaction and [2,3]‐rearrangement in a one pot reaction open to air from N ‐hydroxybenzotriazin‐4‐ones and alkenyl boronic acids at room temperature. Experimental results showed that the copper catalyst not only played as cross‐coupling catalyst but also served as Lewis acid catalyst to control the chemoselectivity of [2,3]‐rearrangement. The reaction tolerated various linear and cyclic disubstituted alkenyl boronic acids. Moreover, α‐benzotriazinium ketone could be easily prepared in gram scales. The present method highlights dual roles of copper catalyst and [2,3]‐rearrangement of N,O‐vinyl moiety.
ISSN:1615-4150
1615-4169
DOI:10.1002/adsc.202400639