[C:1]([O:5][C:6]([N:8]1[CH:13]2[CH2:14][CH2:15][CH:9]1[CH2:10][CH:11]([OH:16])[CH2:12]2)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(N(CC)CC)C.[CH3:24][S:25](Cl)(=[O:27])=[O:26]>CN(C)C1C=CN=CC=1.ClCCl>[C:1]([O:5][C:6]([N:8]1[CH:13]2[CH2:14][CH2:15][CH:9]1[CH2:10][CH:11]([O:16][S:25]([CH3:24])(=[O:27])=[O:26])[CH2:12]2)=[O:7])([CH3:4])([CH3:2])[CH3:3]Compound 1010 (7.55 g, 33.2 mmol), triethylamine (5.1 mL, 37 mmol), and 4-dimethylaminopyridine (36 mg, 0.3 mmol) were taken into 100 mL of dichloromethane and cooled to 5° C. in an ice bath. Methanesulfonyl chloride (2.6 mL, 33.2 mmol) was added to the solution dropwise and the reaction warmed to room temperature and stirred at room temperature for 18 hours. The reaction was washed with water and brine, dried over anhydrous sodium sulfate, and the solvent removed under reduced pressure to afford 10.2 g of 3-methanesulfonyloxy-8-aza-bicyclo[3.2.1]octane-8-carboxylic acid tert-butyl ester as a mixture of isomers (Compound 1011) as a clear yellow oil; 1H NMR (300 MHz, DMSO-d6): δ 5.09-5.01 (m, 1H), 4.28 (s, 1H), 4.22 (s, 1H), 3.01 (s, 3H), 2.20-1.97 (m, 6H), 1.71-1.66 (m, 2H), 1.46 (s, 9H). This compound was used without further purification.
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