Sodium Iodide → 4-(4-Fluorobenzyl)-3-(4-isobutoxybenzyl)-8-(3-morpholin-4-yl-propyl)-1-oxa-3,8-diaza-spiro[4.5]decan-2-one, dihydrochloride

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69NLS77 (300 mg, 0.57 mmol) was N-BOC deprotected as described in the preparation of 69NLS79-II and dissolved in acetonitrile (3 mL) and DMF (1 mL). To a solution of morpholine (65 μL, 0.74 mmol) in acetonitrile (3 mL) and DMF (1 mL) was added dropwise 1-chloro-3-iodopropane (73 μL, 0.68 mmol) and potassium carbonate (300 mg, 2.17 mmol). The mixture was heated at 50° C. for 3 h before the addition of the solution containing the deprotected spiropiperidine followed by sodium iodide (102 mg, 0.68 mmol). The mixture was stirred overnight at 50° C. and worked up as described for 69NLS79-II. Purification of the residue by silica gel column chromatography, eluting with a stepwise gradient of 0-6% methanol in dichloromethane, afforded the desired compound (127 mg, 40%) as a colorless oil. Treatment of the product in dichloromethane with 2 M HCl in diethylether as described for 69NLS75 gave the corresponding dihydrochloride salt as a colorless solid.

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