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Microwave mediated reduction of nitro and azido arenes to N-arylformamides using Zn–HCOONH 4 is described. In the absence of microwave conditions, this methodology affords amines. This protocol has been extended to the synthesis of pyrrolo[2,1-c][1,4]benzodiazepines and 4(3H)-quinazolinones.
Reductive homocoupling of aryl halides in the presence of commercial zinc dust and ammonium formate in methanol produces biaryls in good to excellent yields. Aryl halides having either electron-donating or electron-withdrawing groups underwent smooth coupling to afford the corresponding symmetrical biaryls. Addition of 1equiv of sodium hydroxide enhanced the coupling reaction rate. Commercial zinc...
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