Br[C:2]1[C:12]([NH:13][CH:14]([CH2:17][CH3:18])[CH2:15][CH3:16])=[CH:11][C:5]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[C:4]([CH3:19])[N:3]=1.[C-:20]#[N:21].[Na+].C([Sn](Cl)(CCCC)CCCC)CCC>C(#N)C.O>[C:20]([C:2]1[C:12]([NH:13][CH:14]([CH2:17][CH3:18])[CH2:15][CH3:16])=[CH:11][C:5]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[C:4]([CH3:19])[N:3]=1)#[N:21]
To a solution of ethyl 6-bromo-2-methyl-5-(pentan-3-ylamino)nicotinate (1.202 g, 3.65 mmol) in acetonitrile (30 ml) was added sodium cyanide (0.357 g, 7.3 mmol), tributyltin chloride (1.306 g, 4.015 mmol) and Pd(dpppf)3 (0.298 g, 0.365 mmol). The reaction mixture was stirred at 88° C. overnight. The reaction mixture was diluted with water (100 ml), then extracted with ethyl acetate (3×100 ml). The organic layer was washed with saturated aqueous sodium bicarbonate and brine. After evaporation of solvent, ethyl 6-cyano-2-methyl-5-(pentan-3-ylamino)nicotinate (0.59 g, 59% yield) was obtained by column chromatography. 1H NMR (400 MHz, CDCl3): 7.56 (s, 1H), 4.50 (q, J=6.8 Hz, 2H), 4.35 (br, s, 1H), 3.40 a9m, 1H), 2.64 (s, 3H), 1.80-1.50 (m, 4H), 1.42 (t, J=6.8 Hz, 3H), 1.0 (t, 6H). MS (EI) for C15H21N3O2: 276.2 (MH+).
Wird geladen…
