反应详情

A mixture of 1-[4-chloro-6-(4-morpholinyl)-1,3,5-triazin-2-yl]-2-(difluoromethyl)-4-methoxy-1H-benzimidazole (0.40 g, 1 mmol), tert-butyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydropyridine-1(2H)-carboxylate (0.382 g, 1.24 mmol), PdCl2(dppf) (63 mg), and 2 M aqueous Na2CO3 (8 mL) in dioxane (40 mL) was refluxed under nitrogen for 2 hrs. The dioxane was removed under vacuum and the residue was extracted into CH2Cl2. Chromatography on silica eluting with hexanes/EtOAc (8:2) gave 0.27 g (50% yield) of tert-butyl 5-[4-[2-(difluoromethyl)-4-methoxy-1H-benzimidazol-1-yl]-6-(4-morpholinyl)-1,3,5-triazin-2-yl]-3,4-dihydro-1(2H)-pyridinecarboxylate: 1H NMR (CDCl3) δ 8.59 (s, 1H), 7.99 (d, J=8.4 Hz, 1H), 7.60 (t, JHF=53.6 Hz, 1H), 7.34 (t, J=8.2 Hz, 1H), 6.81 (d, J=8.1 Hz, 1H), 4.04 (s, 3H), 4.02-3.75 (m, 8H), 3.71-3.64 (m, 2H), 2.56 (t, J=6.1 Hz, 2H), 2.00-1.91 (m, 2H), 1.57 (s, 9H).

1. temperaturewas refluxed under nitrogen for 2 hrs
2. customThe dioxane was removed under vacuum
3. extractionthe residue was extracted into CH2Cl2