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Communication | Special issue | Vol 99, No. 1, 2019, pp.118-125
Published online, 14th November, 2018
DOI: 10.3987/COM-18-S(F)48
One-Step Synthesis of 4H-3,1-Benzoxazin-4-ones from Weinreb Amides and 1,4,2-Dioxazol-5-ones via Cobalt-Catalyzed C–H Bond Activation

Iku Tanimoto, Kentaro Kawai, Akane Sato, Tatsuhiko Yoshino,* and Shigeki Matsunaga*

*Faculty of Pharmaceutical Sciences, Hokkaido University, Kiat12, Nishi 6, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan

Abstract

A one-step synthesis of 4H-3,1-benzoxazin-4-ones from readily available Weinreb amides and 1,4,2-dioxazol-5-ones under Cp*Co(III) catalysis is described. The reactions proceeded in moderate to good yields with high functional group compatibility.