Sodium Pyrosulfite → HCID 178435557, compound

Participants

Reaction Steps

Starting with 100 mg of 5-ethyl-2H-pyrazole-3-carboxaldehyde, 134 mg of 3,4-ethylenedioxy-1,2-phenylenediamine, and 153 mg of sodium metabisulphite, in 1 ml of ethanol and 3 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 m/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), 60 mg of 2-(5-ethyl-2H-pyrazol-3-yl)-4,5-ethylenedioxy-1H-benzimidazole are obtained in the form of a brown lacquer, the characteristics of which are as follows:

Provenance & Evidence