C(S([NH:7][C:8]([CH:18]1[CH2:20][CH2:19]1)([CH3:17])[CH2:9][C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])=O)(C)(C)C.O1CCOCC1>Cl.C(OCC)(=O)C>[NH2:7][C:8]([CH:18]1[CH2:19][CH2:20]1)([CH3:17])[CH2:9][C:10]([O:12][C:13]([CH3:16])([CH3:14])[CH3:15])=[O:11]tert-butyl 3-(tert-butylsulfinylamino)-3-cyclopropyl-butanoate (example 229a, 1.93 g, 6.36 mmol) was dissolved in a 4M solution of hydrochloric acid in dioxane (4.77 ml, 19.1 mmol) and the reaction mixture was stirred at room temperature for 30 minutes. The reaction was then diluted with ethyl acetate and poured into a separatory funnel. The organic phase was extracted with a 2M aqueous solution of sodium carbonate. The organic phase was dried over sodium sulfate and evaporated down to dryness to yield the title compound (1.08 g, 85%) as a crude oil which was used without any purification. MS (ESI, m/z): 200.3 (M+H+).
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