[O:1]1[C:5]2([CH2:10][CH2:9][CH:8]([NH2:11])[CH2:7][CH2:6]2)[O:4][CH2:3][CH2:2]1.O.C([O-])(O)=O.[Na+].[C:18](Cl)([Cl:20])=[O:19]>C(Cl)Cl.C1(C)C=CC=CC=1>[O:1]1[C:5]2([CH2:10][CH2:9][CH:8]([NH:11][C:18]([Cl:20])=[O:19])[CH2:7][CH2:6]2)[O:4][CH2:3][CH2:2]1Dissolve 1,4-dioxaspiro[4.5]decan-8-amine (785 mg, 0.005 mol; see Liebigs (1990) Ann. chem. 8:781-7) in CH2Cl2 and then add H2O (20 mL) followed by saturated NaHCO3 solution (50 mL). Add a toluene solution of phosgene (20% solution, 5 mL) to the reaction mixture and stir at room temperature for 1 hour. Dry the CH2Cl2 layer (Na2SO4) and concentrate under reduced pressure. Dissolve the resulting oil in dry toluene to produce a stock solution (˜0.2 M) of (1,4-dioxa-spiro[4.5]dec-8-yl)-carbamoyl chloride. B. 1′-(1,4-dioxa-spiro[4.5]dec-8-yl-carbamoyl)-spiro[isobenzofuran-1,4′-piperidin]-3-one
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