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

Participants

Reaction Steps

A mixture of 7-chloro-5-(4-chloro-phenyl)-pyrazolo[1,5-a]pyrimidine (example C.5, step 2) (1.06 g, 4.0 mmol), triethylamine (0.84 mL), and 5% Pd—C (0.1 g) in EtOH (40 mL) was stirred in an atmosphere of hydrogen for 1.5 h. The catalyst was filtered off, the solution was evaporated in vacuo and the residue was crystallized from EtOAc/cyclohexane to give 5-(4-chloro-phenyl)-pyrazolo[1,5-a]pyrimidine (0.62 g, 67%) as a pale-yellow solid. MS (ISP) 230.4 [(M+H)+]; mp 178–180° C.

Provenance & Evidence