Synthesis of Chiral Cyclopropyl Carbocyclic Purine Nucleosides<i>via</i>Asymmetric Intramolecular Cyclopropanations Catalyzed by a Chiral Ruthenium(II) Complex
The synthesis of chiral cyclopropyl carbocyclic purine nucleoside analogues via the highly enantioselective intramolecular cyclopropanation reactions has been reported. With a chiral ruthenium(II)‐phenyloxazoline complex as the catalyst, cyclopropyl carbocyclic purine nucleoside analogues containing three contiguous stereocenters were obtained with up to 99% yield and 99% ee. Furthermore, a chiral