The introduction of chiral auxiliaries at the C- or N-atom in starting nitrones has been investigated as a stereoselective synthetic route to heterocyclic nucleoside analogues. The carbohydrate auxiliary at nitrogen atom gave the best results, thus allowing an easy and enantioselective synthesis of isoxazolidinyl thymine 26 .
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Chiacchio et al. (1999) studied this question.
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