Synthesis of 2,3-Dihydro-6H-1-oxa-3a-aza-phenalene and Its Benzo/Hetero-Fused Analog

[摘要]：A simple and efficient method for the synthesis of highly substituted benzo- and hetero-fused analog of 2, 3-dihydro-6H-oxa-3a-aza-phenalene was developed using 2H-1, 4-benzoxazine and alpha-oxoketene dithio-acetals.

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