Pyrazole → 1-Pyrazol-1-yl-5H-6-thia-4,5-diaza-chrysene 6,6-dioxide

Participants

Reaction Steps

KOtBu (76 mg, 0.68 mmol) was added to a solution of pyrazole (51 mg, 0.76 mmol) in DMSO (1 ml) at 0° C. in a sealed tube and the mixture was stirred at room temperature for 15 min. 1-Chloro-5H-6-thia-4,5-diaza-chrysene 6,6-dioxide 305 (80 mg, 0.252 mmol) was added and the mixture was heated at 100° C. for 4 h. After cooling, the mixture was poured onto ice and the aqueous was extracted with iPA: chloroform (30:70). The organic phase was dried (Na2SO4) and concentrated in vacuo. The crude residue was purified by column chromatography with chloroform/MeOH (98:2) to give the title compound (25 mg, 29%).

Provenance & Evidence