Synthesis of 1,4-dihydro-2H-3,1-benzoxazin-2-ones by hydriodic acid-mediated cyclization of t-butyl 2-vinylphenylcarbamates.

[摘要]：A two-step facile synthesis of 4,4-disubstituted 1,4-dihydro-2H-3,1-benzoxazin-2-ones starting from a-substituted 2-aminostyrenes was described. The method involved the hydriodic acid-mediated cyclization of t-Bu 2-vinylphenylcarbamate derivs., which could be easily prepd. by N-t-butoxycarbonylation of a-substituted 2-aminostyrene derivs., under mild conditions.

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