Carbodiimide → HCID 178509158, compound

Participants

Reaction Steps

A solution of malonic acid monobenzyl ester (1.5 eq, 0.26 mmol) in anhydrous DMF (3 mL) was added to a 10 mL reaction vessel containing PS-carbodiimide (2 eq, 380 mg). The reaction mixture was stirred at ambient temperature under argon for 10 minutes before a solution of 5-aminomethyl-4-[(3-fluorophenyl)hydrazono]-4H-pyrazol-3-ylamine (40 mg, 0.17 mmol) in anhydrous DMF (3 mL) was added. The mixture was further stirred for approximately 16 hours before it was filtered, washed with DMF (3×3 mL) and concentrated under reduced pressure. The title compound was obtained in a yield of 38 mg (55%) as a yellow powder with no further purification. MS (m/z, ES+): 411 (M+1, 100%); 1H NMR (ppm, 300 MHz, DMSO-d6) δ 11.40 (brs, 1H, N—H pyrazole), 8.45 (s, 1H, N—H amide), 7.40-7.60 (m, 3H, Ar—H), 7.28-7.35 (m, 5H, Ar—H), 7.05-7.15 (t, 1H, F—Ar—H), 5.15 (s, 2H, benzyl CH2), 4.47 (s, 1H, CHaHb amide), 4.43 (s, 1H, CHaHb amide), 3.35 (2H, CH2 pyrazole-overlap with H2O).

Provenance & Evidence