Triethylamine → 3-amino-6-bromo-N'-(phenylcarbonyl)pyrazine-2-carbohydrazide

Participants

Reaction Steps

TBTU (22.09 g, 68.80 mmol) and triethylamine (4.642 g, 6.394 mL, 45.87 mmol) were added to a suspension of 3-amino-6-bromo-pyrazine-2-carboxylic acid (10 g, 45.87 mmol) and benzohydrazide (7.494 g, 55.04 mmol) in DMF (100.0 mL) and the resulting solution stirred at ambient temperature for 48 hours and then poured into water (400 mL) with vigorous stirring. This was allowed to stir for 30 minutes, filtered and washed with water. The moist solid was dissolved in hot EtOAc, dried (MgSO4), filtered and concentrated in vacuo and the resultant solid dried under vacuum to give the desired product (11.34 g, 73% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.51 (2H, m), 7.61 (1H, m), 7.69 (2H, br s), 7.92 (2H, m), 8.44 (1H, s), 10.48 (1H, br s), 10.54 (1H, br s) ppm; MS (ES+) 338.01.

Provenance & Evidence