Water → 2-(4-Methoxy-3,5-dimethylphenyl)-5-methylsulfanyl-7-propoxyoxazolo[5,4-d]pyrimidine

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Reaction Conditions

Reaction Steps

5.9 g of 2-(4-methoxy-3,5-dimethylphenyl)-5-methylsulfanyloxazolo[5,4-d]pyrimidin-7-ol were dissolved in 150 ml of N,N-dimethylformamide, and 7.7 g of potassium carbonate and then 2.7 g of 1-bromopropane were added. The solution was stirred at 60° C. for 5 h and then, after cooling, poured into 150 ml of water. The precipitate was filtered off with suction. The regioisomer mixture obtained was purified by silica gel chromatography (50 g silicon dioxide solute cartridge, heptane/ethyl acetate 9/1). In addition to 1.4 g of 2-(4-methoxy-3,5-dimethylphenyl)-5-methylsulfanyl-6-propyl-6H-oxazolo[5,4-d]pyrimidin-7-one (LC/MS (Method LC1): Rt=1.43 min; m/z=360.13 [M+H]+), 2.5 g of the title compound were obtained.

Provenance & Evidence