反应详情

CF3COOH (4 mL) was added to the solution of tert-butyl 4-(5-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octan-2-yl)-1,2,4-oxadiazol-3-yl)piperidine-1-carboxylate (960 mg, 2.0 mmol) in 16 mL of CH2Cl2 at 0° C. The mixture was stiffed at 0° C. for 2 hrs, then concentrated to give (2S,5R)-6-(benzyloxy)-2-(3-(piperidin-4-yl)-1,2,4-oxadiazol-5-yl)-1,6-diaza-bicyclo[3.2.1]octan-7-one (1.1 g) as a brown oil, which was used directly in the next step. ESI-MS (EI+, m/z): 384.2 [M+H]+.

1. concentrationconcentrated