Dimethylformamide → 4-Chloro-3-(2-methyl-6-trifluoromethyl-pyridine-3-carbonyl)bicyclo[3.2.1]oct-3-en-2-one

Participants

Reaction Conditions

Reaction Steps

20.15 g (0.062 mo l) of 4-hydroxy-3-(2-methyl-6-trifluoromethyipyridine-3carbonyl)-bicyclo[3.2.1]oct-3-en-2-one are suspended in 50 ml of oxalyl chloride, and 0.1 ml of dimethylformamide are added dropwise. After the intensive evolution of gas has ceased, the mixture is kept at a bath temperature of 45° C. for another 1.5 hours and then evaporated, and the residue is suspended in a little ethyl acetate and admixed with stirring at 0° C. with hexane. Filtration gives 19.19 g (90% of theory) of 4-chloro-3-(2-methyl-6-trifluoromethyl-pyridine-3-carbonyl)bicyclo[3.2.1]oct-3-en-2-one of m.p. 137-138° C.

Provenance & Evidence