Diisopropylamine → 3-Pyrimidin-5-ylethynyl-7-trifluoromethyl-5-(4-trifluoromethyl-phenyl)-pyrazolo[1,5-a]pyrimidine

Participants

Reaction Conditions

Reaction Steps

To a flask was added 3-ethynyl-7-trifluoromethyl-5-(4-trifluoromethyl-phenyl)-pyrazolo[1,5-a]pyrimidine (example C.1) (159 mg, 0.45 mmol), 4-Bromopyrimidine (87 mg, 0.55 mmol, commercially available [CAS 4595-59-9]), PdCl2(NCPh)2 (13 mg, 7 mol %), and CuI (10 mg, 12 mol %). The flask was charged with Ar, then 3 mL of dioxane (degassed with Ar), tri-(tert-butyl)phosphine (0.12 mL of a 0.25M soln in dioxane, 33 mol %), and diisopropylamine (0.15 mL) were added. The r×n mixture was stirred at 23° C. under Ar overnight, then filtered through a pad of Si-gel, concentrated, purified by Si-gel chromatography (EtOAc/heptane 5-40:95-60) to give an orange solid. Recrystallization from EtOAc/heptane (1:2) yielded the product as an orange solid (131 mg, 68%). MS (ISP) 434.1 [(M+H)+]; mp 175° C.

Provenance & Evidence