反应详情

A mixture of 5′,6′-Dicyano-3′-(pyridin-4-ylmethoxy)-2,3,5,6-tetrahydro-[1,2′]bipyrazinyl-4-carboxylic acid tert-butyl ester (100 mg) and 30% TFA in DCM (11 ml) was stirred for 2 hours. The mixture was concentrated in vacuo to dryness. To the residue was added DCM (5 ml), TEA (0.31 mmol, 51 ul), and 3,5-bis(trifluoromethyl)phenyl isocyanate (0.15 mmol, 26 ul). The resulting mixture was stirred at room temperature for 3 hours. After concentrated in vacuo, the crude product was purified by column on silica using 70% EtOAc/Hexanes to give the product N-[3,5-bis(trifluoromethyl)phenyl]-4-{5,6-dicyano-3-[(pyridin-4-ylmethyl)oxy]pyrazin-2-yl}piperazine-1-carboxamide. 1H NMR (CD3OD) 8.594 (s, 2H), 8.073 (s, 2H), 7.555-7.534 (m, 3H), 5.584 (s, 2H), 4.043-4.029 (m, 4H), 3.739-3.713 (m, 4H) ppm.

1. concentrationThe mixture was concentrated in vacuo to dryness
2. stirringThe resulting mixture was stirred at room temperature for 3 hours
3. concentrationAfter concentrated in vacuo
4. customthe crude product was purified by column on silica using 70% EtOAc/Hexanes