反应详情

Et3N (5 g, 0.05 mol) and tert-butyl(((tert-butoxycarbonyl)amino)(1H-pyrazol-1-yl)methylene)carbamate (5.5 g, 17.5 mmol) were added to a solution of (5R)-2-(5-(1-(aminomethyl)cyclopropyl)-1,3,4-oxadiazol-2-yl)-6-(benzyloxy)-1,6-diaza-bicyclo[3.2.1]octan-7-one (7 g, 0.017 mol) in CH3OH (500 mL). The mixture was stirred at rt for 4 hrs and then concentrated. The residue was purified by silica gel column chromatography (gradient elution 50 to 66% EtOAc/petroleum ether) to afford (5R)-2-(5-(1-(2,3-bis-(tert-butoxycarbonyl)-guanidinomethyl)cyclopropyl)-1,3,4-oxadiazol-2-yl)-6-(benzyloxy)-1,6-diaza-bicyclo[3.2.1]octan-7-one (9 g, 86%) as a white solid. ESI-MS (EI+, m/z): 612.3 [M+H]+.

1. concentrationconcentrated
2. customThe residue was purified by silica gel column chromatography (gradient elution 50 to 66% EtOAc/petroleum ether)