Diisopropyl Ether → HCID 57494528, compound

Participants

Reaction Conditions

Reaction Steps

5-Methyl-isoxazol-3-ylamine (392 mg, 3.99 mmol), dimethyl diacetoxyfumarate (1.04 g, 3.99 mmol) and p-toluenesulphonic acid (10 mg) were combined in a capped vial and heated to 100° C. After 5 h the reaction was cooled to room temperature and ethanol (2.5 mL) and iso-propyl ether (2.5 mL) was added to the residue which was sonicated for 15 min. The resulting precipitate collected by filtration and washed with cold ethanol (5 mL) and dried on the pump to afford 6-hydroxy-2-methyl-7-oxo-7H-isoxazolo[2,3-a]pyrimidine-5-carboxylic acid methyl ester (331 mg, 37%): 1H NMR (300 MHz, D6DMSO) δ 2.50 (3H, s, CH3), 3.84 (3H, s, OCH3), 6.67 (1H, s, H3), 10.31 (1H, br s, OH).

Provenance & Evidence