Valeryl chloride → HCID 57455389, compound

Participants

Reaction Steps

Valeryl chloride (1.8 mL, 15.3 mmol, 1.1 eq) was added dropwise to a solution of ethyl 4-[(3-amino[1,5]naphthyridin-4-yl)amino]butyrate (3.8 g, 13.9 mmol, 1 eq) in dichloromethane (55 mL) and stirred for one hour. The reaction mixture was concentrated under reduced pressure and was dissolved in pyridine (55 mL). Pyridine hydrochloride (0.16 g, 1.39 mmol, 0.1 eq) was added and the reaction mixture was heated to reflux for 18 hours. The reaction mixture was concentrated under reduced pressure and diluted with dichloromethane (100 mL) and saturated aqueous sodium bicarbonate (75 mL). The phases were separated and the aqueous phase was extracted with dichloromethane (2×30 mL). The combined organics were dried over magnesium sulfate, stirred over decolorizing charcoal, filtered through CELITE filter aid, concentrated under reduced pressure, and dried at 35° C. under high vacuum to afford 4.18 g of ethyl 4-(2-butyl-1H-imidazo[4,5-c][1,5]naphthyridin-1-yl)butyrate as a brown solid.

Provenance & Evidence