反应详情

A mixture of 2-(difluoromethyl)-4-methoxy-1H-benzimidazole (Example 2) (0.99 g, 5 mmol), tert-butyl 4-(4,6-dichloro-1,3,5-triazin-2-yl)piperazine-1-carboxylate (Lowik et al, Eur. J. Org. Chem., 2001, 2825) (2.0 g, 6 mmol), and 3.5 g (25 mmol) powdered K2CO3 in 40 mL DMF was stirred at room temperature for 1 hr. Water was added, and the product was collected by filtration and washed with water and cold ethanol to give 2.14 g (86% yield) of tert-butyl 4-(4-chloro-6-(2-(difluoromethyl)-4-methoxy-1H-benzimidazol-1-yl)-1,3,5-triazin-2-yl)piperazine-1-carboxylate: mp (CH2Cl2/EtOH)>300° C.; 1H NMR (CDCl3) δ7.99 (d, J=8.3 Hz, 1H), 7.48 (t, JHF=53.4 Hz, 1H), 7.41 (t, J=8.3 Hz, 1H), 6.87 (d, J=8.0 Hz, 1H), 4.06 (s, 3H), 3.95 (m, 4H), 3.58 (m, 4H), 1.50 (s, 9H); Anal. Calcd. for C21H24ClF2N7O3: C, 50.9; H, 4.9; N, 19.8. Found: C, 51.1; H, 4.9; N, 19.95%.

1. filtrationthe product was collected by filtration
2. washwashed with water and cold ethanol