Water → HCID 22315284, compound

Participants

Reaction Conditions

Reaction Steps

A 1.0M solution of boron tribromide in methylene chloride (7.43 mL, 7.43 mmol) at 25° C. was treated with a solution of 3-cyclopentyl-2-(3,4-dimethoxy-phenyl)-N-thiazol-2-yl-propionamide (prepared as in Example 113, 0.27 g, 0.74 mmol) in methylene chloride (7.43 mL). This solution was stirred at 25° C. for 1 h. At this time, the reaction was cooled to 0° C. and treated with a dilute aqueous ammonium hydroxide solution. This mixture was stirred at 0° C. for 20 min. At this time, the reaction was poured into water and was extracted with chloroform (3×50 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dihydroxy-phenyl)-N-thiazol-2-yl-propionamide (38.8 mg, 15.7%) as a white solid: mp 170-173° C.; EI-HRMS m/e calcd for C17H20N2O3S (M+) 332.1194 found 332.1192.

Provenance & Evidence