Water → 4-(5-Amino-6-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-yl)benzoic acid

Participants

Reaction Conditions

Reaction Steps

5-bromo-3-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-amine (200 mg, 0.6287 mmol) 4-carboxyphenylboronic acid (104.3 mg, 0.6287 mmol) and Na2CO3 (133.2 mg, 1.257 mmol) were suspended in MeCN (3.314 mL)/water (3.314 mL) and the mixture de-gassed (×5) and treated with Pd(PPh3)4 (72.65 mg, 0.06287 mmol). The reaction was de-gassed again and heated at 110° C. in the microwave for 30 minutes. The mixture was concentrated to half its original volume and washed with DCM. The aqueous phase was acidified to pH4 (2M HCl) and resulting precipitate collected, washed with water and dried under vacuum (172 mg, 76% Yield). 1H NMR (400.0 MHz, DMSO) d 7.41 (2H, br s), 7.69 (2H, m), 7.76 (1H, m), 7.98 (2H, m), 8.09 (2H, m), 8.29 (2H, m), 8.94 (1H, s); MS (ES+) 360.98

Provenance & Evidence