反应详情

16.4 g (304 mmol) of sodium methoxide was added to a toluene 150 ml solution of 18.5 g (47.5 mmol) of 4-(2,3,4-trimethoxy-6-methylbenzoyl)-3-chloro-5-trifluoromethylpyridine obtained in step (c) and 16.6 ml (95.4 mmol) of hexamethylphosphoric triamide, followed by stirring under reflux by heating for 30 minutes. Water was added thereto to terminate the reaction, the aqueous layer was extracted with ethyl acetate, and the organic layer was dried over anhydrous sodium sulfate and subjected to filtration, and the solvent was distilled off under reduced pressure. The crude product thus obtained was purified by silica gel column chromatography to obtain 11.7 g (yield 64%) of 4-(2,3,4-trimethoxy-6-methylbenzoyl)-3-methoxy-5-trifluoromethylpyridine (compound No. 122; m.p. 103-106° C.).

1. temperatureunder reflux
2. temperatureby heating for 30 minutes
3. customto terminate
4. customthe reaction
5. extractionthe aqueous layer was extracted with ethyl acetate
6. dry with materialthe organic layer was dried over anhydrous sodium sulfate
7. filtrationsubjected to filtration
8. distillationthe solvent was distilled off under reduced pressure
9. customThe crude product thus obtained
10. customwas purified by silica gel column chromatography