Monomers for Preparation of Amide-Linked RNA: Asymmetric Synthesis of All Four Nucleoside 5‘-Azido 3‘-Carboxylic Acids
作者:Eriks Rozners、Yang Liu
DOI:10.1021/jo0515879
日期:2005.11.1
couplings, the nucleoside aminoacid equivalents. Herein, we report enantioselective synthesis of 5‘-azido 3‘-carboxylic acid derivatives of allfour natural ribonucleosides. The key transformations in our synthesis are a double asymmetric ene reaction and a stereoselective iodolactonization that form the basic carbon skeleton of the modified ribose. Standard nucleoside synthesis is followed by a short