Benzenesulfonyl chloride → 1-(Benzenesulfonyl)-3-(SR)-benzenesulfonyloxymethyl-4-(SR)-phenylpyrrolidine

A solution of 196 mg (1.1 mmol) of 3-(SR)-hydroxymethyl-4-(SR)-phenylpyrrolidine (from Example 1, Step C) and 27 mg (0.2 mmol) of 4-(N,N-dimethylamino)pyridine in 5 mL of pyridine at 0 ° C. was treated with 488 mg (2.8 mmol) of benzenesulfonyl chloride. The cooling bath was removed and the resulting mixture was stirred at rt for 1 h. The reaction mixture was treated with an additional 290 mg of benzenesulfonyl chloride and the resulting mixture was stirred at rt for 1 h. The reaction mixture was partitioned between 50 mL of ether and 20 mL of sat'd CuSO4 and the layers were separated. The organic layer was washed with 30 mL of H2O, 30 mL of sat'd NaCl, dried over MgSO4 and concentrated in vacuo. Flash chromatography on 30 g of silica gel using3:2 v/v hexanes/ether afforded 340 mg (67%) of the title compound as a solid. 1H NMR (500 MHz, CDCl3): δ2.65-2.72 (m, 1H), 3.21 (dd, J=7.8, 10.3, 1H), 3.44-3.67 (6H), 6.94-7.90 (15H). Mass Spectrum (NH3-CI): m/z 458 (M+1).