HCID 22242929, compound → HCID 22242754, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-methanesulfonyloxy-l-{4-[3-(p-nitrobenzyloxycarbonylamino)azetidine-1-carbonyl]-1,3-thiazol-2-yl}azetidine (390 mg, 0.787 mmol) (obtained as described in Reference Example 75(3)) in dimethylformamide (20 ml) was added potassium thioacetate (539 mg, 4.72 mmol) at room temperature and the mixture was stirred in an oil bath (80° C.) for 10.5 hours. After checking the completion of the reaction, the mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution. The organic layer was washed with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (1:3)→ethyl acetate as the eluant to afford 3-acetylthio-1-{4-[3-(p-nitrobenzyloxycarbonylamino)azetidine-1-carbonyl]-1,3-thiazol-2-yl}azetidine (195 mg, yield 52%) as a pale brown solid.

Provenance & Evidence