Sodium Carbonate → HCID 67215375, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 6-aminonicotinic acid (191 mg, 1.38 mmol) in chlorobenzene (2 mL) was added 1,1′-carbonyl-diimidazole (224 mg, 1.38 mmol) and the resulting mixture stirred for 2 h at 90° C. After the suspension was cooled to ambient temperature 5-methyl-3-phenyl-isoxazole-4-carboxylic acid hydrazide (200 mg, 0.92 mmol) was added and stirred for 1 h at 90° C. After the reaction mixture was cooled to ambient temperature phosphorous oxychloride (0.84 mL, 9.20 mmol) was added and stirring was continued for 4 h at 90° C. The cooled reaction mixture was poured carefully onto a mixture of ethyl acetate (20 mL) and aqueous sodium carbonate (saturated, 20 mL) and was stirred for 1 h at ambient temperature. The aqueous layer was separated and extracted with ethyl acetate (20 mL) and the combined organic layers were washed with aqueous sodium carbonate (saturated). Drying over sodium sulfate and purification by chromatography (SiO2, heptane:ethyl acetate:dichloromethane:methanol=40:40:20:0 to 0:75:20:5) afforded the title compound (27 mg, 9%) as a white solid. MS: m/e=320.0 [M+H]+.

Provenance & Evidence