C(N(CC)CC)C.[S:8](Cl)([CH3:11])(=[O:10])=[O:9].[OH:13][CH:14]1[CH2:17][C:16]2([CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18]2)[CH2:15]1>ClCCl>[CH3:11][S:8]([O:13][CH:14]1[CH2:15][C:16]2([CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18]2)[CH2:17]1)(=[O:10])=[O:9]0.76 mL (5.49 mmol) of triethylamine and then 0.43 mL (5.49 mmol) of mesyl chloride are added to a solution of 1.52 g (4.99 mmol) of tert-butyl 2-hydroxy-6-azaspiro[3.4]octane-6-carboxylate, obtained in step 6.1., in 45 mL of dichloromethane. The reaction medium is stirred at room temperature for 1 hour 30 minutes. After evaporating off the solvent, water is added to the reaction medium, the aqueous phase is separated out and extracted several times with dichloromethane, the combined organic phases are washed with saturated aqueous sodium chloride solution and dried over sodium sulfate, and the filtrate is concentrated under reduced pressure. After evaporating off the solvent, 1.90 g of product are obtained in the form of a brown oil, which is used without further purification in the following step.
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