Benzaldehyde → HCID 178480690, compound

Participants

Reaction Conditions

Reaction Steps

N-(5-Hydrazinocarbonyl-1H-thieno[2,3-c]pyrazol-3-yl)-4-(4-methylpiperazin-1-yl)-benzamide (0.150 g, 0.318 mmol, 1 eq.), ethanol (1 mL) and, by syringe, benzaldehyde (0.048 mL, 0.47 mmol, 1.3 eq.) are placed in a dry 5 mL round-bottomed flask under argon. Two drops of 5 N hydrochloric acid are added to the suspension. The reaction mixture is stirred at a temperature in the region of 50° C. for 3 hours, the solvent is then evaporated off and the residue is placed directly on a column of neutralized silica gel. Elution is performed with a methanol/dichloromethane mixture (10/90 by volume). The product obtained is directly added to a mixture of 1 mL of tetrahydrofuran and 0.5 mL of 5 N hydrochloric acid. The precipitate obtained is filtered off, washed with water and dried. N-[5-(Benzylidenehydrazinocarbonyl)-1H-thieno[2,3-c]pyrazol-3-yl]-4-(4-methylpiperazin-1-yl)benzamide is obtained in the form of a white solid (0.029 g, 16%). MS: ES m/z=488 MH+ base peak. 1H NMR (400 MHz, (CD3)2SO-d6, δ in ppm): 2.53 (partially masked s, 3H); 2.87 (m, 4H); 3.47 (m, 4H); 7.03 (d, J=9.0 Hz, 2H); from 7.39 to 7.49 (m, 3H); 7.79 (d, J=7.5 Hz, 2H); 8.01 (d, J=9.0 Hz, 2H); 8.28 (s, 1H); 8.39 (s, 1H).

Provenance & Evidence