Synlett 2020; 31(10): 1003-1006
DOI: 10.1055/s-0039-1690831
letter
© Georg Thieme Verlag Stuttgart · New York

Efficient Synthesis of 4H-3,1-Benzoxazine Derivatives via One-Pot Sequential Passerini-Azide/Palladium-Catalyzed Azide–Isocyanide Coupling/Cyclization Reaction

Qi-Xun Feng
,
Zhi-Ying Mu
,
Gang Yao
,
Jia-An Zhang
,
Hui-Ting He
,
Yong-Long Pang
,
Jun Xiong

This research is funded by a Research Project of Hubei Provincial Department of Education (No. Q20192806) and by a Doctoral Research Fund of Hubei University of Science and Technology (No. BK201808).
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Publikationsverlauf

Received: 14. Januar 2020

Accepted after revision: 02. Februar 2020

Publikationsdatum:
18. Februar 2020 (online)


Abstract

A new, one-pot method for the synthesis of 4H-3,1-benzoxazine derivatives has been developed. The Passerini-azide reactions of 2-azidobenzaldehydes, trimethylsilyl azide, and isocyanides produced azide intermediate without separation, which then reacted with isocyanides to give 4H-3,1-benzoxazine derivatives via a tandem one-pot palladium-catalyzed azide–isocyanide coupling/cyclization reaction in moderate to good yields.

Supporting Information