Trifluoroacetic acid → HCID 71761253, compound

Participants

Reaction Conditions

Reaction Steps

TFA (0.30 mL) was added to a 0° C. mixture of tetrabutylammonium tert-butyl 4-(5-((2S,5R)-7-oxo-6-(sulfooxy)-1,6-diazabicyclo[3.2.1]octan-2-yl)-1,3,4-oxadiazol-2-yl)piperazine-1-carboxylate (21 mg, 0.03 mmol) in dry DCM (0.80 mL). The reaction mixture was stirred at 0° C. for 2-3 hrs then diluted with ether (˜15 mL). The precipitate was collected via centrifugation, washed with ether (3×) and dried under high vacuum to afford (2S,5R)-7-oxo-2-(5-(piperazin-1-yl)-1,3,4-oxadiazol-2-yl)-1,6-diazabicyclo[3.2.1]octan-6-yl hydrogen sulfate (4 mg, 35%) as a light yellow solid after prep-HPLC purification using ammonium formate buffer. ESI-MS (EI+, m/z): 375.2. 1H NMR (300 MHz, D2O) δ 4.65 (d, J=6.6 Hz, 1H), 4.19 (br s, 1H), 3.80-3.65 (m, 2H), 3.38-3.28 (m, 2H), 3.20-3.16 (m, 1H), 2.99-2.95 (m, 1H), 2.32-1.88 (m, 4H).

Provenance & Evidence