The selectivity of opening of the dihydropyrimidine ring in 2,5′-anhydro-5,6-dihydrouridine (I) and its 2-thio-analogue (II) into 4,9-dioxa-2-aza- and 4-thia-9-oxa-2-azabicyclo[4,2,1]nonanes has been shown to be dependent upon the reaction media.
V. Škarić and M. Hohnjec, J. Chem. Soc., Chem. Commun., 1973, 495 DOI: 10.1039/C39730000495
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