Diisopropylethylamine → HCID 86701021, compound

Participants

Reaction Conditions

Reaction Steps

To a 0° C. solution of tert-butyl 3-hydrazinyl-3-oxopropyl(methyl)carbamate (4.3 g, 19.8 mmol) and (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid (4.9 g, 0.0178 mol) in DMF (100 mL) was added HATU (8.2 g, 0.0218 mol), followed by dropwise addition of DIPEA (9.6 mL, 0.0594 mol) slowly. The mixture was stirred at 0° C. for 1 h, and then quenched with ice water. The aqueous layer was extracted with EtOAc (2×). The combined organic layer was dried over Na2SO4, filtered and concentrated. The residue was purified by silica gel column chromatography (gradient elution 20˜60% EtOAc/petroleum ether) to afford tert-butyl 3-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinyl)-3-oxopropyl(methyl)carbamate (6.7 g, 78%) as a white solid. ESI-MS (EI+, m/z): 476 [M+H]+.

Provenance & Evidence