反应详情

To a solution of N′-(1H-benzimidazol-2-ylmethyl)-N′-(5,6,7,8-tetrahydro-8-quinolinyl)-1,4-benzenedimethanamine (397 mg, 1.0 mmol) in THF (10 mL) was added N,N′-di-t-butoxycarbonyl-pyrazole-1-carboxamidine (370 mg, 1.2 mmol) and potassium carbonate (207 mg, 1.5 mmol) and the mixture stirred at room temperature for 16 h. The reaction was diluted with aqueous NH4Cl (15 mL) and the mixture extracted with ethyl acetate (3×10 mL). The combined organic fractions were dried (Na2SO4), filtered, concentrated and purified by chromatography on silica gel (19:1 CH2Cl2/MeOH) to afford N′,N″-di-t-butoxycarbonyl-N-(4-{[(1H-benzimidazol-2-ylmethyl)-(5,6,7,8-tetrahydroquinolin-8-yl)-amino]-methyl}-benzyl)-guanidine as a pale foam (426 mg, 67%). 1H NMR (CDCl3) δ 1.25 (s, 9H), 1.44 (s, 9H), 1.65 (m, 1H), 1.99 (m, 2H), 2.04 (m, 1H), 2.72–2.79 (m, 2H), 3.73 (s, 2H), 3.94 (d, 1H, J=16.1 Hz), 4.07 (m, 1H), 4.11 (d, 1H, J=12.1 Hz), 4.51 (d, 2H, J=6.2 Hz), 7.14 (m, 4H), 7.39 (m, 3H), 7.55 (m, 1H), 7.63 (m, 1H), 8.47 (m, 1H (NH)), 8.66 (d, 1H, J=4.8 Hz).

1. extractionthe mixture extracted with ethyl acetate (3×10 mL)
2. dry with materialThe combined organic fractions were dried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated
5. custompurified by chromatography on silica gel (19:1 CH2Cl2/MeOH)