反应详情

N1-Boc-N-(4-methoxybenzyl)benzimidazol-5-amine (353 mg; 1 mmol; 1 eq.) was dissolved in DMF (5 ml), treated with K2CO3 (166 mg; 1.2 mmol; 1.2 eq.) and benzylbromide (0.143 ml; 1.2 mmol; 1.2 eq.) and stirred at room temperature for 24 h. The mixture was diluted with water and extracted with ethyl acetate (3×25 ml). The combined organic layers were dried over Na2SO4 and evaporated. The remains were taken up with THF (5 ml), treated with 5 N NaOCH3 and stirred for 2 h at room temperature. The mixture was diluted with water and extracted with ethyl acetate (3×25 ml). The combined organic layers were dried over Na2SO4 and evaporated. The residue was purified by flash chromatography on silica using a CHCl3/MeOH gradient. Yield: 0.049 g (14.3%); MS m/z: 344.1 [M+H]+; 1H-NMR (500 MHz, DMSO d6): δ 3.70 (s, 3H); 4.60 (s, 2H), 4.64 (s, 2H); 6.71 (d, 1H, 4J=2.1 Hz); 6.77 (dd, 1H, 4J=2.1 Hz, 3J=8.9 Hz); 6.85-6.88 (m, 2H); 7.19-7.22 (m, 3H); 7.26-7.32 (m, 4H); 7.34 (d, 1H, 3J=8.9 Hz); 7.99 (s, 1H); HPLC (METHOD [A]): rt 15.26 min (99.8%)

1. extractionextracted with ethyl acetate (3×25 ml)
2. dry with materialThe combined organic layers were dried over Na2SO4
3. customevaporated
4. additiontreated with 5 N NaOCH3
5. stirringstirred for 2 h at room temperature
6. additionThe mixture was diluted with water
7. extractionextracted with ethyl acetate (3×25 ml)
8. dry with materialThe combined organic layers were dried over Na2SO4
9. customevaporated
10. customThe residue was purified by flash chromatography on silica using a CHCl3/MeOH gradient
11. customrt 15.26 min (99.8%)