Phosphorus oxychloride → HCID 57929911, compound

Participants

Reaction Steps

A 5 mL round-bottomed flask equipped with a reflux condenser outfitted with a nitrogen inlet adapter was charged with 4-amino-5-isopropyl-4H-1,2,4-triazole-3-thiol (0.15 g, 0.95 mmol, Enamine) and 6-(2,4-difluorophenyl)imidazo[2,1-b]oxazole-5-carboxylic acid (0.25 g, 0.95 mmol) in POCl3 (3.5 mL, 38 mmol) to give a tan suspension. The reaction mixture was heated at about reflux for about 18 h, allowed to cool, and then poured over stirring ice water. The mixture was diluted with DCM and the layers were separated. The organic layer was concentrated under reduced pressure. The resulting residue was purified via silica gel chromatography eluting with a gradient of 0-5% MeOH in DCM to provide a white solid (0.055 g) which was dissolved in a minimal amount of hot ACN and left to cool to ambient temperature for about 2 h. The resulting crystals were isolated by filtration, washed with ACN, and dried under vacuum to give the title compound (0.020 g, 5%): LC/MS (Table 1, Method b) Rt=1.95 min; MS m/z: 387.2 (M+H)+.

Provenance & Evidence