[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[S:8]([CH:11]1[CH2:16][CH2:15][N:14](C(OC(C)(C)C)=O)[CH2:13][CH2:12]1)(=[O:10])=[O:9].Cl>O1CCOCC1>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[S:8]([CH:11]1[CH2:16][CH2:15][NH:14][CH2:13][CH2:12]1)(=[O:9])=[O:10]A solution of tert-butyl 4-((2-fluorophenyl)sulfonyl)piperidine-1-carboxylate (1.31 g, 3.82 mmol) in dioxane (12.7 mL) at room temperature was treated with 4M HCl in dioxane (9.55 ml, 38.2 mmol). The reaction mixture was allowed to stir at room temperature overnight. The reaction mixture was concentrated under reduced pressure. The resulting white solid was triturated with hexanes, filtered, collected, and lyophilized overnight to give the title compound, as its HCl salt, as a white solid (815.1 mg, 76%). ESI-MS m/z [M+H]+243.95.
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