4-Methylmorpholine → tert-butyl (4S,7S,10aS)-7-carbamoyl-5-oxooctahydro-2H-pyrido[2,1-b][1,3]thiazepin-4-ylcarbamate

Participants

Reaction Conditions

Reaction Steps

Isobutyl chloroformate (31.2 mg, 0.229 mmol) was added to a solution of (4S,7S,10aS)-4-(tert-Butoxycarbonylamino)-5-oxooctahydro-2H-pyrido[2,1-b][1,3]thiazepine-7-carboxylic acid (75 mg, 0.22 mmol) and 4-methylmorpholine (26.4 mg, 0.261 mmol) in DCM at 0° C. After stirring for 30 min at 0° C., NH4OH was added. The ice bath was removed and the reaction mixture was stirred at rt for 30 min. The reaction mixture was concentrated and the residue was partitioned between EtOAc and aqueous 0.5 N HCl. The organic phase was isolated, washed with saturated aqueous NaHCO3 and saturated aqueous NaCl, dried over MgSO4, filtered and concentrated to give tert-butyl (4S,7S,10aS)-7-carbamoyl-5-oxooctahydro-2H-pyrido[2,1-b][1,3]thiazepin-4-ylcarbamate (67 mg, 0.20 mmol, 90% yield) as an oil. Anal. Calcd. for C15H25N3O4S m/z 343.4. found: 344.3 (M+H)+.

Provenance & Evidence