[NH:1]1[C:5]2([CH2:14][CH2:13][C:8]3([O:12][CH2:11][CH2:10][O:9]3)[CH2:7][CH2:6]2)[C:4](=O)[NH:3][C:2]1=[O:16].[H-].[H-].[H-].[H-].[Li+].[Al+3].[C@H](O)(C([O-])=O)[C@@H](O)C([O-])=O.[Na+].[K+]>C1COCC1>[NH:1]1[C:5]2([CH2:14][CH2:13][C:8]3([O:12][CH2:11][CH2:10][O:9]3)[CH2:7][CH2:6]2)[CH2:4][NH:3][C:2]1=[O:16]A suspension of 9,12-dioxa-1,3-diaza-dispiro[4.2.4.2]tetradecane-2,4-dione (9.64 g, 42.6 mmol) in 143 mL of dry THF was treated at 0° C. with a solution of LiAlH4 1M in THF (94.0 mL, 94.0 mmol). The resulting mixture was stirred overnight at room temperature under nitrogen. An aqueous saturated solution of Rochelle's salt was added. It was stirred for 3 h, extracted 4× with EtOAc and 3× with dichloromethane. Organic portions were combined and concentrated. The crude was purified by silica gel column chromatography using a gradient from 1% CH2Cl2:MeOH to 10% CH2Cl2:MeOH as eluent to afford 9,12-Dioxa-1,3-diaza-dispiro[4.2.4.2]tetradecan-2-one (5.20 g, 57%) as a white solid.
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