Lewis Acid Catalyzed (3+2)‐Cycloaddition of Chiral Pyrimidinyl‐Substituted Cyclopropanes with Nitrosoarenes or Silyl Enol Ethers

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Chiral isoxazole and carbocyclic pyrimidine nucleoside analogues were synthesized by way of (3+2)-cycloadditions of chiral pyrimidinyl-substituted dimethyl cyclopropanedicarboxylates. In the existence of MgI 2 , (3+2)-cycloadditions of chiral pyrimidinyl-substituted cyclopropanes with nitrosoarenes afforded numerous chiral isoxazole pyrimidine nucleoside analogues in up to 7

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