反应详情

Part B. To a solution of 2-{5-[(E)-2-(4-fluoro-phenyl)-vinyl]-pyrazin-2-yl}-4-methyl-thiazole-5-carboxylic acid benzylamide (20 mg, 0.05 mmol, 1.0 equiv) in ethyl acetate/ethanol (1:1) was added Pd(OH)2 (10 mg, 20%). The flask was first purged with nitrogen, then with hydrogen. The reaction mixture was stirred at ambient temperature for 3 hr and monitored by LCMS. Upon completion, the reaction mixture was diluted with ethyl acetate, filtered through Celite and concentrated in vacuo. The crude product was purified by preparative HPLC (acetonitrile/water, 0.1% trifluoroacetic acid) to afford 2-{5-[2-(4-fluoro-phenyl)-ethyl]-pyrazin-2-yl}-4-methyl-thiazole-5-carboxylic acid benzylamide (13 mg, 65%). 1H NMR (400 MHz, CD2Cl2) δ 9.27 (s, 1H), 8.27 (s, 1H), 7.27-7.35 (m, 5H), 7.12-7.15 (m, 2H), 6.92-6.96 (m, 2H), 6.19 (bs, 1H), 4.58 (d, J=4.0 Hz, 2H), 3.05-3.16 (m, 4H), 2.72 (s, 3H); HRMS (M+H)+=433.15.

1. customThe flask was first purged with nitrogen
2. additionUpon completion, the reaction mixture was diluted with ethyl acetate
3. filtrationfiltered through Celite
4. concentrationconcentrated in vacuo
5. customThe crude product was purified by preparative HPLC (acetonitrile/water, 0.1% trifluoroacetic acid)