Acetic Acid → 3-{5-amino-4-[3-(4-methyl-piperazin-1-ylmethyl)-benzoyl]-pyrazol-1-yl}-N-cyclopropyl-4-methyl-benzamide

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Reaction Steps

To a mixture of 3-[5-amino-4-(3-formyl-benzoyl)-pyrazol-1-yl]-N-cyclopropyl-4-methyl-benzamide 6 (Example 9, 1.0 eq) and 1-methyl-piperazine (1.09 eq) in equal volume of 1,2-dichloroethane and dichloromethane was added AcOH (0.96 eq) Sodium triacetoxyborohydride (1.5 eq) was then added. The reaction mixture was stirred at room temperature for 2 h. Aqueous NaOH was added to quench the reaction and the mixture was extracted with ethyl acetate. The organic layer was separated and washed with water and saturated NaCl solution. The organic layer was then dried over Na2SO4, filtered and concentrated to give a residue that could be purified by silica gel chromatography (eluent: 9/1 CH2Cl2/methanol then 9/1/0.05 CH2Cl2/MeOH/NH3H2O). Yield 67%. MS m/z 473.3 [M+H]+; 1H NMR (300 MHz, CDCl3) δ0.61 (m, 2H), 0.86 (m, 2H), 2.26 (s, 3H), 2.30 (s, 3H), 2.52 (brs, 8H), 2.90 (m, 1H), 3.60 (s, 2H), 5.87 (brs, 1H), 6.30 (brs, 2H), 7.45 (m, 3H), 7.70 (m, 2H), 7.83 (m, 3H) ppm.

Provenance & Evidence