4-Bromobenzene-1,2-diamine → HCID 178435558, compound

Participants

Reaction Steps

Starting with 20 mg of 5-ethyl-2H-pyrazole-3-carboxaldehyde, 30 mg of 4-bromo-1,2-phenylenediamine and 30 mg of sodium metabisulphite, in 1 ml of ethanol and 2 ml of dimethylformamide, and after purification by SPE (SCX phase, washing with methanol, extraction with 2N ammoniacal methanol) followed by a reverse-phase HPLC (5 mm C18 phase, dimensions: 100×25 mm, flow rate 20 ml/min, elution gradient: acetonitrile/0.07% TFA-water/0.07% TFA from 5-95 to 95-5 (v/v)), and desalification by SPE (SCX phase, washing with methanol, extraction with 2N ammoniacal methanol), 21 mg of 2-(5-ethyl-2H-pyrazol-3-yl)-5-bromo-1H-benzimidazole are obtained in the form of a yellow powder, the characteristics of which are as follows:

Provenance & Evidence