Sodium hydride → HCID 22322122, compound

Participants

Reaction Steps

To a stirred mixture of 0.366 g (8.4 mmol) of sodium hydride (60% in oil) in 10 ml of dry 1-methyl-2-pyrrolidinone was added (portionwise) 2.34 g (8.4 mmol) of methyl (4-methoxybenzenesulfonyl)pyridin-3-ylmethyl-amine. The mixture was stirred at room temperature until gas evolution ceased and 1.80 g of (7.0 mmol) of ethyl 4-chloro-3-methylisothiazolo[5,4-b]pyridine-5-carboxylate added. The mixture was heated at 80-90° C. for 44 hours, the solvent removed under vacuum and the residue diluted with water. The mixture was extracted with ethyl acetate and the extract washed with 2N citric acid, H2O, 1 N NaHCO3, brine and dried (Na2SO4). The solution was filtered through a thin pad of hydrous magnesium silicate and the pad washed with ethyl acetate. The filtrate was concentrated to dryness to give 2.39 g of ethyl 4-[(4-methoxybenzenesulfonyl)-pyridin-3-ylmethylamino]-3-methylisothiazolo[5,4-b]pyridine-5-carboxylate as a yellow solid, m.p. 142-144° C.

Provenance & Evidence