Über 4-Ureidooctahydropyrano[4,3-d]pyrimidinone

Zusammenfassung 5,6-Dihydro-2H-pyran-3-aldehyde reagieren mit Harnstoff zu 4-ureidooctahydropyrano4,3-d]pyrimidin-2-ones. Einwirkung von Säure führt das 4-Ureidooctahydropyrano4,3-d]pyrimidin-2-on in das 4-(2-Hydroxyäthyl)-hexahydropyrimido4,5-d]pyrimidin-2,7-dion über.

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Heterocycles, XVIII: 4-Ureido-octahydropyrano4,3-d]-pyrimidinones

5,6-Dihydro-2H-pyran-3-aldehydes react with urea to give 4-ureidooctahydropyrano4,3-d]pyrimidin-2-ones. 4-Ureidooctahydropyrano4,3-d]pyrimidin-2-one is cleaved by HCl to 4-(2-hydroxyethyl)-hexahydropyrimido4,5-d]pyrimidin-2,7-dione.