[CH2:1]([N:8]1[CH2:13][CH2:12][O:11][CH:10]([C:14]#[N:15])[CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)C.Cl.[NH2:20][OH:21].C(=O)(O)[O-].[Na+]>C(Cl)(Cl)Cl.O>[CH2:1]([N:8]1[CH2:13][CH2:12][O:11][CH:10]([C:14]([NH2:15])=[N:20][OH:21])[CH2:9]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1
To a stirred solution of 4-benzylmorpholine-2-carbonitrile (intermediate 25, 5.0 g, 24.7 mmol) in the mixture of ethanol and water (2/1, 75 ml) was added hydroxylamine hydrochloride (5.2 g, 74.2 mmol) and sodium bicarbonate (13.1 g, 123.5 mmol), and the reaction mixture was stirred under reflux for 12 hours. The reaction was diluted with chloroform, and the reaction mixture was washed with water and brine. The organic layer was dried over magnesium sulfate, and concentrated in vacuo. The resulting 4-benzyl-N′-hydroxymorpholine-2-carboxamidine (intermediate 26) was used for next reaction without further purification.
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