反应详情

1-(4,6-Dichloro-2-pyrimidinyl)-2-(difluoromethyl)-1H-benzimidazole (International Publ. No. WO 2002/088112, the disclosure of which is incorporated herein by reference in its entirety) (0.315 g, 1 mmol) was added to a mixture of 3-aminopyridine (0.28 g, 3 mmol) and LDA (1.5 mL, 2 M in THF, 3 mmol) in 10 mL THF at room temperature. After 10 min, the mixture was neutralized with HOAc, diluted with water, extracted with EtOAc, and dried (Na2SO4). Chromatography on silica, eluting with CH2Cl2/EtOAc (3:2) gave a solid, which was recrystallized from i-Pr2O to give 0.252 g (67% yield) of 6-chloro-2-[2-(difluoromethyl)-1H-benzimidazol-1-yl]-N-(3-pyridinyl)-4-pyrimidinamine: mp (i-Pr2O) 233-236° C.; 1H NMR (DMSO-d6) δ 10.42 (br, 1H), 8.72 (d, J=2.3 Hz, 1H), 8.43 (dd, J=4.7, 1.4 Hz, 1H), 8.26 (m, 1H), 8.01 (ddd, J=8.3, 2.5, 1.5 Hz, 1H), 7.86 (m, 1H), 7.62 (t, JHF′=52.9 Hz, 1H), 7.48-7.42 (m, 3H), 6.86 (s, 1H); Anal. Calcd. for C17H11ClF2N6: C, 54.8; H, 3.0; N, 22.55. Found: C, 54.75; H, 3.0; N, 22.7%.

1. extractionextracted with EtOAc
2. dry with materialdried (Na2SO4)
3. washChromatography on silica, eluting with CH2Cl2/EtOAc (3:2)
4. customgave a solid, which
5. customwas recrystallized from i-Pr2O