C([O:4][CH2:5][CH2:6][CH:7]1[O:12][CH2:11][CH2:10][N:9]([C:13]([O:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)=[O:14])[CH2:8]1)(=O)C.[OH-].[K+].C(O)C>O>[OH:4][CH2:5][CH2:6][CH:7]1[O:12][CH2:11][CH2:10][N:9]([C:13]([O:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)=[O:14])[CH2:8]1A mixture of 2-(2-acetoxyethyl)-4-benzyloxycarbonylmorpholine (24.5 g), potassium hydroxide (8.9 g), ethanol (40 ml), and water (40 ml) is refluxed for 30 minutes and concentrated under reduced pressure. Water is added to the residue and the mixture is extracted with diethyl ether. The organic layer is washed with water, dried over sodium sulfate, and evaporated to give the title compound (15 g) as an oil.
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