Pyridine → HCID 66733393, compound

Participants

Reaction Steps

Tolvaptan (5.0 g) and pyridine (1.1 ml) were suspended in dichloromethane (50 ml). Chloromethyl chloroformate (1.1 ml) was added thereto under cooling with ice, and the mixture was stirred at room temperature for 30 minutes. The reaction mixture was washed with water, dried over anhydrous sodium sulfate. After filtration and concentration under reduced pressure, the residue was purified by silica gel flash chromatography (n-hexane:ethyl acetate=70:30→50:50). The purified product was concentrated under reduced pressure to obtain 6.1 g of chloromethyl {7-chloro-1-[2-methyl-4-(2-methyl-benzoylamino)-benzoyl]-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-yl} carbonate as white amorphous solid.

Provenance & Evidence