A Convenient Synthesis of Difluoromethyl-Substituted Pyridines
摘要:
The treatment of α-alkoxycarbonyl-α,β-unsaturated trifluoromethyl ketones 1 with β-aminocrotonates 2 affords 2-methyl-6-trifluoromethyl-1,4-dihydropyridines 3, which undergo dehydrofluorination using DBU/piperazine, giving moderate to high yields of 2-difluoromethyl-6-methylpyridines 4.