B(Cl)(Cl)Cl.C([O:12][N:13]1[C:19](=[O:20])[N:18]2[CH2:21][C@H:14]1[CH2:15][CH2:16][C@H:17]2[C:22]1[S:26][N:25]=[CH:24][N:23]=1)C1C=CC=CC=1.CO>C(Cl)Cl>[OH:12][N:13]1[C:19](=[O:20])[N:18]2[CH2:21][C@H:14]1[CH2:15][CH2:16][C@H:17]2[C:22]1[S:26][N:25]=[CH:24][N:23]=1BCl3 (1 M in DCM, 3.0 mL, 3.0 mmol) was added dropwise to a solution of (2S,5R)-6-(benzyloxy)-2-(1,2,4-thiadiazol-5-yl)-1,6-diazabicyclo[3.2.1]octan-7-one (190 mg, 0.60 mmol) in dry DCM (20 mL) at −78° C. The mixture was stirred at 0° C. for 6 hrs., then, MeOH (3 mL) was added slowly at −78° C. The solvents were evaporated under vacuum to give (2S,5R)-6-hydroxy-2-(1,2,4-thiadiazol-5-yl)-1,6-diaza-bicyclo[3.2.1]octan-7-one (110 mg, 80%) as a yellow solid, which was directly used in the next step. ESI-MS (EI+, m/z): 227.1 [M−H]−.
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