7-Chloro-2-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-5-amine → Methyl 4-(7-chloro-2-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-5-ylcarbamoyl)benzoate

Participants

Reaction Conditions

Reaction Steps

7-chloro-2-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-5-amine (0.5 g, 1.0 equivalent) was suspended in pyridine (0.2 M) in a round bottom flask. At 0° C. was added a solution of terephthalic acid monomethylester chloride (2.0 equivalents) pre-dissolved in pyridine (0.8M), and followed by addition of N,N-dimethylpyridin-4-amine (0.1 equivalent). The mixture was stirred vigorously at 0° C. for 48 h. The reaction was quenched with saturated NaHCO3; pyridine was removed in vacuo and the residue was extracted with EtOAc twice and the combined organic layers were dried over Na2SO4. The organic layers were concentrated in vacuo and the crude mixture was purified using chromatography (SiO2, gradient of 10 to 50% EtOAc/hexanes) to afford the titled compound (10%) as a solid. Melting point (191.0-195.0° C.). 1H NMR (400 MHz, DMSO-d6) δ ppm 3.90 (s, 3 H) 7.20 (s, 1 H) 8.06-8.11 (m, 2 H) 8.12-8.18 (m, 2 H) 8.32 (s, 1 H) 11.88 (s, 1 H); ESI-MS: m/z 399.0 (M+H)+.

Provenance & Evidence