Triphenylphosphine dibromide → 5-Bromo-3-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-amine

Participants

Reaction Steps

3-amino-6-bromo-pyrazine-2-carboxylic acid (1.000 g, 4.588 mmol) and benzenecarbothiohydrazide (759.1 mg, 4.588 mmol) were suspended in acetonitrile (25.00 mL), cooled in an ice bath and then treated with dibromo-triphenyl-phosphorane (4.453 g, 10.55 mmol) The reaction mixture was allowed to stir in an ice bath for 2 hours and then DIPEA (1.778 g, 2.396 mL, 13.76 mmol) was added slowly at 10° C. The reaction was left to stir at 0-10° C. for a further hour and the resultant precipitate was isolated by filtration, washed with a small amount of acetonitrile and dried (659 mg, 43% Yield). MS (ES+) 335.93

Provenance & Evidence