Facile One-Pot Synthesis of N-Difluoromethyl-2-pyridone Derivatives
摘要:
A novel one-pot synthesis of N-difluoromethyl-2-pyridones is described. N-(Pyridin-2-yl) acetamide derivatives were excellent precursors for the preparation of N- difluoromethyl-2-pyridone derivatives. Difluoromethylation of 2-acetaminopyridine derivatives was achieved with sodium chlorodifluoroacetate as a difluorocarbene source in the presence of a catalytic amount of 18-crown-6. Subsequent in situ hydrolysis of resultant 1,2-dihydro-2-acetimino-1-difluoromethylpyridines proceeded under mild acidic conditions to afford the corresponding N-difluoromethyl-2-pyridones in moderate to good yields.
[EN] SUBSTITUTED 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5A] PYRIDINE DERIVATIVES AND USE THEREOF [FR] DÉRIVÉS DE 2-AMINO-PYRAZOLYL-[1,2,4]TRIAZOLO[1,5 A] PYRIDINE SUBSTITUÉS ET LEUR UTILISATION