Synthesis of 1(3H)-iminobenzo[c]thiophene derivatives by hydriodic acid-mediated cyclization of 2-(vinyl)thiobenzamide derivatives.

[摘要]：Secondary 2-(vinyl)thiobenzamide derivs., easily prepd. by reacting 2-lithiostyrene derivs. with various isothiocyanates, undergo intramol. cyclization on treatment with concd. hydriodic acid to produce 1(3H)-iminobenzo[c]thiophene derivs., e.g., I, in fair-to-good yields. Some of them have been hydrolyzed under acidic conditions to afford benzo[c]thiophen-1(3H)-one derivs. in good yields.

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