tert-butyl N-(prop-2-yn-1-yl)carbamate → HCID 130217018, compound

Participants

Reaction Steps

tert-Butyl prop-2-yn-1-ylcarbamate (0.37 g, 2.4 mmol) was added to the solution of (2S,5R)-6-(benzyloxy)-N-hydroxy-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbimidoyl chloride (˜2.0 mmol) in dry DCM (20 mL), followed by the addition of TEA (0.31 mL, 2.2 mmol) in dry DCM (2.0 mL) over a period of 30 minutes. The reaction mixture was stirred at rt overnight, then the mixture was diluted with EtOAc, washed with water and saturated sodium chloride. The organic layer was dried over Na2SO4, concentrated and purified by silica gel column chromatography (1:2 petroleum ether/EtOAc) to afford tert-butyl((3-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octan-2-yl)isoxazol-5-yl)methyl)carbamate (180 mg, 21% for two steps) as a white solid. ESI-MS (EI+, m/z): 429.1 [M+H]+. 1H NMR (500 MHz, CDCl3): δ 7.45-7.35 (m, 5H), 6.24 (s, 1H), 5.09 (d, J=11.5 Hz, 1H), 4.93 (d, J=11.5 Hz, 1H), 4.58 (d, J=7.5 Hz, 1H), 4.43 (m, 2H), 3.32 (s, 1H), 2.86-2.84 (m, 1H), 2.68 (d, J=11.5 Hz, 1H), 2.34-2.30 (m, 1H), 2.23-2.18 (m, 1H), 2.10-2.04 (m, 1H), 1.82-1.78 (m, 1H), 1.45 (s, 9H).

Provenance & Evidence