Toluene → 4-(2,3,4-Trimethoxy-6-methylbenzoyl)-3-chloro-5-methoxypyridine

Participants

Reaction Steps

5.0 g (2.8 mmol) of hexamethylphosphoric triamide and 1.1 g (2.1 mmol) of sodium methoxide were added to a toluene (60 ml) solution of 5.0 g (1.4 mmol) of 4-(2,3,4-trimethoxy-6-methylbenzoyl)-3,5-dichloropyridine (compound No. 191), followed by stirring under reflux by heating for 5 hours. After the mixture was cooled, 50 ml of water was added to the mixture to terminate the reaction, and ethyl acetate was added thereto for extraction. 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 3.4 g (yield 69%) of 4-(2,3,4-trimethoxy-6-methylbenzoyl)-3-chloro-5-methoxypyridine (compound No. 244; pale yellow oily substance).

Provenance & Evidence