Nitropyridines: IV. Synthesis of 3-(2-furyl)biphenyls by recyclization of nitropyridinium salts
摘要:
The two-component Hantzsch synthesis using 3-(2-furyl)-2-nitro-1-phenylprop-2-en-1-one and various enamines gave the corresponding nitro-substituted dihydropyridines which were converted into nitropyridines and N-methylpyridinium salts. Recyclization of the latter by the action of aqueous-alcoholic alkali led to the formation of 3-(2-furyl)-2-nitrobiphenyl derivatives.