Boron tribromide → HCID 59423976, compound

Participants

Reaction Conditions

Reaction Steps

Boron tribromide (1M in dichloromethane, 1.42 mL, 1.42 mmol) was added to an ice-cooled solution of the product of example 117(70 mg, 0.142 mmol) in dichloromethane (5 mL) and the mixture was stirred at 0° C. for 1 hour. The reaction was then quenched with 0.88 ammonia (20 mL) and the solution stirred at room temperature for 18 hours. The organic layer was separated. The aqueous layer was extracted with dichloromethane (20 mls). The combined organic solution was washed with saturated sodium hydrogen carbonate solution (10 mL) and dried over magnesium sulfate and concentrated in vacuo. Purification of the residue by column chromatography on silica gel, eluting with pentane:ethyl acetate:methanol:0.88 ammonia (90/10/1), 85:15 to 50:50. The resulting gum was dissolved in methanol (5 mls) and 1N hydrochloric acid in diethyl ether (0.5 ml) added. The solution was evaporated and the solid recrystallised from ethyl acetate/methanol to give the title compound hydrochloride salt as a purple solid in 30% yield, 22 mgs.

Provenance & Evidence