Shi B, Zhang Y, Miao S, Jin F, Yu C, Zhang K, Yao C. Synthesis of Isoxazol-5(2
H)-one Derivatives via (
tBuO)
2Mg Promoted [3 + 2] Annulations of δ-Acetoxy Allenoates with Hydroxylamine.
J Org Chem 2024. [PMID:
38805080 DOI:
10.1021/acs.joc.4c00732]
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Abstract
Herein, an efficient (tBuO)2Mg promoted [3 + 2] annulation of δ-acetoxy allenoates with N-benzylhydroxylamine has been developed. This method provides a concise and facile protocol to synthesize vinylated isoxazol-5(2H)-one derivatives stereospecifically in a broad substrate scope with high efficiency (31 examples, up to 87% yield).
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