Sulfuric acid magnesium salt (1:1) → HCID 24783156, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-amino-4-methylthiazole (57 mg, 0.50 mmol) in dioxane (1.2 mL) was added trimethylaluminium (2 M in heptane, 251 μl, 0.50 mmol). The resulting red-brown solution was stirred for 1 h at ambient temperature before 2-(5-methyl-3-phenyl-isoxazol-4-ylethynyl)-isonicotinic acid methyl ester (40 mg, 0.13 mmol) was added. The reaction mixture was heated for 2.25 h at 110° C. before cooling to ambient temperature. Water (29 μL) was added and the mixture was stirred for 10 min at ambient temperature. Magnesium sulfate was added and the mixture was filtered over Hyflo®. Concentration and purification by chromatography (SiO2, heptane:ethyl acetate=95:5 to 0:100) was followed by separation between hydrochloric acid (1 M, 30 mL) and ethyl acetate (100 mL). The organic layers were washed with brine, dried over sodium sulfate and were concentrated affording the title compound (48 mg, 96%) as an off-white solid. MS: m/e=401.2 [M+H]+.

Provenance & Evidence