Br[C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]#[N:10])=[CH:4][CH:3]=1.[C:11]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])(=[O:14])[CH:12]=[CH2:13].C1(C)C=CC=CC=1P(C1C=CC=CC=1C)C1C=CC=CC=1C.C(N(CC)CC)C>C(OCC)(=O)C.C([O-])(=O)C.C([O-])(=O)C.[Pd+2]>[C:16]([O:15][C:11]([CH2:12][CH2:13][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]#[N:10])=[CH:4][CH:3]=1)=[O:14])([CH3:19])([CH3:18])[CH3:17]A mixture of 5 g of p-bromophenylacetonitrile, 4.6 ml of t-butyl acrylate, 57 mg of palladium diacetate, 310 mg of tri-o-tolylphosphine and 12 ml of triethylamine is refluxed for 5 hours. The reaction mixture is diluted with ethyl acetate and washed with 10% HCl and saturated sodium bicarbonate solution. After drying over magnesium sulfate the solvent is removed in vacuo. This material is dissolved in ethanol and hydrogenated over 1.1 g of 10% palladium on carbon catalyst for 3 days at 3 atmospheres pressure of hydrogen. After filtration the solvent is removed in vacuo and the residue is chromatographed on silica gel with ether/hexane (1:1) as the eluent to afford p-(2-t-butoxycarbonyl-ethyl)-phenylacetonitrile; 2.8 g of this product is dissolved in 90 ml of tetrahydrofuran and 50 ml of methanol and to this is added 6.2 g of cobalt chloride in 90 ml of water followed by 2.1 g of sodium borohydride in small portions. After filtration and removal of solvent, the residue is chromatographed on silica gel with 7.5% methanol saturated with ammonia in methylene chloride as the eluent to afford p-(2-t-butoxycarbonyl-ethyl)-2-phenethylamine as an oil.
불러오는 중…
