Diisopropylethylamine → tert-butyl 4-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinecarbonyl)piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

HATU (3.3 g, 8.7 mmol) and tert-butyl 4-(hydrazinecarbonyl)piperidine-1-carboxylate (2.29 g, 9.42 mmol) were added to a 0° C. solution of (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carboxylic acid (2 g, 7.25 mmol) in CH2Cl2 (50 mL), followed by the addition of DIPEA (2.8 g, 21.8 mmol). The reaction mixture was stirred at 0° C. for 12 hrs then washed with water and saturated sodium chloride, dried over Na2SO4, and concentrated. The residue was purified by silica gel column chromatography (gradient elution 1%-10% MeOH/CH2Cl2) to give tert-butyl 4-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinecarbonyl)piperidine-1-carboxylate as a white solid. (2.2 g, 62%). ESI-MS (EI+, m/z): 502.2 [M+H]+.

Provenance & Evidence