HCID 5354160, compound → ethyl 5-fluoro-6-(E)-furfurylideneaminooxy-1,2,3,4,5,6-hexahydro-2,4-dioxopyrimidine-5-carboxylate

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Reaction Conditions

Reaction Steps

In 450 ml of pyridine-acetone (pyridine:acetone=2:1) were dissolved 131 g (0.5 mol) of ethyl 5-fluoro-6-acetoxy-1,2,3,4,5,6-hexahydro-2,4-dioxopyrimidine-5-carboxylate and 66.5 g (0.6 mol) of (Z)-furfuraldoxime, and the solution was stirred at 60° C. for 15 hours. The solvent was evaporated under reduced pressure, and the residual oily material was poured into 3 l of ice-cooled water, and crystals precipitated were collected by filtration. The crystals were washed with water (500 ml×2), dried under reduced pressure and recrystallized from ethanol and then from ethyl acetate-hexane (7:3) to yield 63.5 g of ethyl 5-fluoro-6-(Z)-furfurylideneaminooxy-1,2,3,4,5,6-hexahydro-2,4-dioxopyrimidine-5carboxylate. m.p. 152°-153° C.

Provenance & Evidence