Triethylamine → 5-(4-Chloro-phenyl)-7-trifluoromethyl-3-trimethylsilanylethynyl-pyrazolo[1,5-a]pyrimidine

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-(4-chloro-phenyl)-3-iodo-7-trifluoromethyl-pyrazolo[1,5-a]pyrimidine (example C.4 step 2a and 2b) (13.96 g, 32.96 mmol), trimethylsilylacetylene (5.5 mL, 39.72 mmol) and Et3N (9.2 mL, 67.9 mmol) in dry DMF (33 mL) was stirred for 10 min at 23° C. while being purged with Argon, then PdCl2(PPh3)2 (116 mg, 0.5 mol %), PPh3 (43 mg, 0.5 mol %) and CuI (19 mg, 0.3 mol %) were added. Stirring was continued at 90° C. for 4 h. The react mixture was then cooled to 23° C., diluted with EtOAc, washed water (twice) and brine, dried over Na2SO4. Removal of the solvent left an orange solid (13.30 g, 102%). MS (ISP) 394.1 [(M+H)+-] and 396.1 [(M+2+H)+]; mp 198° C.

Provenance & Evidence