The enantiomeric synthesis of beta-D-cyclopropyl carbocyclic nucleosid
es was achieved via the key intermediate 5. Thymine and uracil derivat
ives 7 and 9 were obtained by oxidation, Curtius rearrangement and the
standard construction method of pyrimidines. The cytosine derivative
10 was prepared from 9 via the 4-triazole intermediate. Copyright (C)
1996 Elsevier Science Ltd.