Acid Catalyzed Cyclization Reaction of 3-Hydrazono-1,1,1-trifluoro-2-alkanones to 6-Trifluoromethyl-3,6-dihydro-2H-[1,3,4]oxadiazines
摘要:
Mechanisms for the acid catalyzed cyclization reaction of 3-dialkylhydrazono-1, 1,1-trifluoro-2-alkanones (1) to 6-trifluoromethyl-3,6-dihydro-2H-[1,3,4]oxadiazines (2) are discussed. The results indicate 1,5-sigmatropic shift of hydrogen atom from N-methyl group to carbonyl carbon center on protonated 1 to be a key step for this cyclization reaction.
Acid Catalyzed Cyclization Reaction of 3-Hydrazono-1,1,1-trifluoro-2-alkanones to 6-Trifluoromethyl-3,6-dihydro-2H-[1,3,4]oxadiazines
摘要:
Mechanisms for the acid catalyzed cyclization reaction of 3-dialkylhydrazono-1, 1,1-trifluoro-2-alkanones (1) to 6-trifluoromethyl-3,6-dihydro-2H-[1,3,4]oxadiazines (2) are discussed. The results indicate 1,5-sigmatropic shift of hydrogen atom from N-methyl group to carbonyl carbon center on protonated 1 to be a key step for this cyclization reaction.