Pyridine → HCID 86701000, compound

Participants

Reaction Steps

(CF3SO2)2O (1.0 mL) was slowly added to a −10° C. solution of tert-butyl (3-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carbonyl)hydrazinyl)-3-oxopropyl)carbamate (1.0 g, 2.17 mmol) and pyridine (1.0 mL) in dry DCM (10 mL). The reaction mixture was allowed to warm to rt and then was stirred at rt for 1 h. Then saturated NaHCO3 was added at 0° C. very slowly. The organic layer was separated and the aqueous layer was exacted with EtOAc (3×). The combined organic layer was dried over Na2SO4 and concentrated. The residue was purified by silica gel column chromatography (gradient elution 10:1 to 4:1 petroleum ether/EtOAc) to give tert-butyl (2-(5-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octan-2-yl)-1,3,4-oxadiazol-2-yl)ethyl)carbamate (0.40 g, 42%) as a slight yellow solid. ESI-MS (EI+, m/z): 444 [M+H]+. 1H NMR (500 MHz, DMSO-d6) δ 7.48-7.46 (m, 2H), 7.45-7.37 (m, 3H), 6.99 (t, J=5.5 Hz, 1H), 4.99-4.94 (m, 2H), 4.59 (d, J=7.0 Hz, 1H), 3.73 (br s, 1H), 3.32-3.26 (m, 2H), 2.96-2.92 (m, 2H), 2.85-2.81 (m, 2H), 2.19-2.15 (m, 1H), 2.05-1.99 (m, 2H), 1.86-1.83 (m, 1H), 1.34 (s, 9H).

Provenance & Evidence