O.[PH2]([O-])=O.[Na+].[C:6]([O:10][C:11](=[O:26])[NH:12][C:13]([CH3:25])([CH3:24])[CH2:14][O:15][C:16]1[CH:21]=[CH:20][C:19]([C:22]#N)=[CH:18][CH:17]=1)([CH3:9])([CH3:8])[CH3:7].N1C=CC=CC=1.C(O)(=[O:35])C>O.[Ni]>[C:6]([O:10][C:11](=[O:26])[NH:12][C:13]([CH3:25])([CH3:24])[CH2:14][O:15][C:16]1[CH:21]=[CH:20][C:19]([CH:22]=[O:35])=[CH:18][CH:17]=1)([CH3:9])([CH3:8])[CH3:7]The title compound was synthesized by referring to J. Chem. Soc., 1962, 3961. To a solution of sodium hypophosphite monohydrate (1.5 g) in water (3 ml) were sequentially added tert-butyl[2-(4-cyanophenoxy)-1,1-dimethylethyl]carbamate (500 mg), pyridine (10 ml) and acetic acid (5 ml). While stirring at room temperature, Raney nickel (50% suspension in water) (2 ml) was added dropwise to the reaction mixture and the solution was stirred for 15 minutes at room temperature and for 1 hour at 40° C. After filtration through celite pad and several wash with tetrahydrofuran and methanol, the solvent was evaporated in vacuo, and the residue was neutralized by adding a saturated aqueous solution of sodium bicarbonate. After extraction with ethyl acetate, the solution was washed with brine, dried over anhydrous magnesium sulfate, and then the solvent was evaporated in vacuo. The residue was purified by silica gel column chromatography (hexane-ethyl acetate system) to provide the title compound (443 mg).
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