CC([S@]([NH:7][C@H:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([C:17]([F:20])([F:19])[F:18])[CH:15]=2)[CH2:10][CH2:9]1)=O)(C)C.[ClH:21].CC(S(OC)=O)(C)C>CO.O1CCOCC1>[ClH:21].[F:18][C:17]([F:19])([F:20])[C:14]1[CH:15]=[C:16]2[C:11]([CH2:10][CH2:9][C@H:8]2[NH2:7])=[CH:12][CH:13]=1Intermediate 15B (370 mg, 1.21 mmol) was stirred in MeOH (5 mL) at rt. 4N HCl in dioxane (2 mL) was added. The resulting mixture was stirred at rt for 20 min. The solvents were evaporated and CH2Cl2 (3×) was added and evaporated. The resulting white solids were vacuum dried for 1 h to give Intermediate 15 (84 mg, 0.35 mmol, 29% yield) and methyl 2-methylpropane-2-sulfinate. The HCl salt was used directly in the next step. 1H NMR (400 MHz, MeOD) δ ppm 7.57 (1 H, d, J=7.8 Hz), 7.47 (1 H, d, J=7.6 Hz), 7.25 (1 H, t, J=7.8 Hz), 4.88 (1 H, dd, J=7.8, 4.8 Hz), 3.09-3.23 (1 H, m), 2.90-3.08 (1 H, m), 2.64 (1 H, dddd, J=14.1, 8.5, 8.3, 5.7 Hz), 2.01-2.23 (1 H, m, J=14.1, 8.7, 5.3, 5.3 Hz).
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