To a solution of intermediate A 3-(bromomethyl)-N-[(1R)-1-(4-fluorophenyl)ethyl]-5-[methyl(methylsulfonyl)amino]benzamide (50 mg, 0.11 mmol) in 1 mL CH2Cl2 cooled to 0° C. was added intermediate III tert-butyl 2-hydroxy-1-(hydroxymethyl)-1-(thien-3-ylmethyl)ethylcarbamate (81 mg, 0.28 mmol), silver triflate (72 mg, 0.28 mmol) and 2,6-ditert-butylpyridine (76 μL, 0.34 mmol). The reaction mixture was stirred at 0° C. for 40 min and purified by flash chromatography (20 g silica, 30->80% EtOAc/hexanes) and by preparative HPLC (5% to 95% CH3CN in water containing 0.1% TFA, C18 PRO YMC 20×150 mm) to afford tert-butyl 2-({3-({[(1R)-1-(4-fluorophenyl)ethyl]amino}carbonyl)-5-[methyl(methylsulfonyl)amino]benzyl}oxy)-1-(hydroxymethyl)-1-(thien-3-ylmethyl) contaminated with 2,6-ditert-butylpyridine. Treatment with 10% TFA in CH2Cl2 for 30 min, followed by concentration under a stream of nitrogen, and purification by preparative HPLC (5% to 95% CH3CN in water containing 0.1% TFA, C18 PRO YMC 20×150 mm) afforded 3-{[2-amino-3-hydroxy-2-(thien-3-ylmethyl)propoxy]methyl}-N-[(1R)-1-(4-fluorophenyl)ethyl]-5-[methyl(methylsulfonyl)amino]benzamide as a TFA salt. 1H NMR (400 MHz, d4-MeOH) δ 8.86 (d, J=7.9 Hz, 1H), 7.83 (s, 1H), 7.80 (s, 1H), 7.65 (s, 1H), 7.48-7.36 (m, 3H), 7.17 (s, 1H), 7.10-7.00 (m, 2H), 6.95 (d, J=5.0 Hz, 1H), 5.30-5.20 (m, 1H), 4.68 (A of AB, d, J=12.0 Hz, 1H), 4.63 (B of AB, d, J=12.0 Hz, 1H), 3.57 (s, 2H), 3.51 (A of AB, d, J=11.0 Hz, 1H), 3.45 (B of AB, d, J=11.0 Hz, 1H), 3.09 (s, 3H), 3.04 (A of AB, d, J=13.6 Hz, 1H), 3.45 (B of AB, d, J=13.6 Hz, 1H), 2.94 (s, 3H), 1.58 (d, J=7.1 Hz, 3H).
