Diisopropylethylamine → HCID 86701042, compound

Participants

Reaction Conditions

Reaction Steps

To a 0° C. solution of (1S,3R)-3-(tert-butoxycarbonylamino)cyclopentanecarboxylic acid (3.8 g, 16.6 mmol) and (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbohydrazide (5.3 g, 18.26 mmol) in DMF (30 mL) were added HATU (7.6 g, 19.92 mmol) and DIPEA (11.6 ml, 66.4 mmol). The reaction mixture was stirred at 0° C. for 1.5 hrs. The reaction mixture was diluted with water and extracted with EtOAc (2×). The combined organic layer was washed with saturated sodium chloride (4×) and citric acid (5% aq.), dried over Na2SO4, and concentrated. The residue was purified by silica gel column (gradient elution 50˜80% EtOAc/petroleum ether) to afford tert-butyl (1R,3S)-3-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl) hydrazinecarbonyl)cyclopentylcarbamate (4.5 g, 55%) as a white solid. ESI-MS (EI+, m/z): 502.3 [M+H]+.

Provenance & Evidence