反应详情

To a stirred solution of 0.044 g of 1,3-dihydro-1-{trans-4-[1-piperazinyl]-1-cyclohexyl}-2H-benzimidazol-2-one and 0.2 mL of triethylamine in 3 mL of dichloromethane was added 0.030 g of pyrimidine-5-carboxylic acid chloride. After 2 h, 5 mL of dilute aqueous ammonia was added and the mixture stirred for an additional 30 min. The organic layer was separated, the aqueous layer extracted with two additional 20 mL portions of chloroform and the combined organic extracts dried over MgSO4 and concentrated under reduced pressure. Chromatography over silica gel eluting with 10% methanol in ethyl acetate gave 0.030 g of 1,3-dihydro-1-{trans-4-[4-(5-pyrimidinecarbonyl)piperazin-1-yl]-1-cyclohexyl}-2H-benzimidazol-2-one as a white solid: 1H NMR (400 MHz, CDCl3) 9.76 (s, 1H), 9.29 (s, 1H), 8.83 (s, 2H), 7.16-7.04 (m, 4H), 4.27 (m, 1H), 3.84 (s, 2H), 3.48 (s, 2H), 2.72 (s, 2H), 2.61 (s, 2H), 2.56 (m, 1H), 2.30 (q, 2H), 2.05 (m, 4H), 1.86 (br s, 1H), 1.5 (q, 2H). The dihydrochloride salt was precipitated from chloroform/ethyl acetate: Analysis calculated for C22H26N6O2.2HCl.0.65 CHCl3C: 48.84, H: 5.18, N: 15.09 found C: 48.85, H: 5.36, N: 14.72.

1. customThe organic layer was separated
2. extractionthe aqueous layer extracted with two additional 20 mL portions of chloroform
3. dry with materialthe combined organic extracts dried over MgSO4
4. concentrationconcentrated under reduced pressure