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
Migratory Hydrogenation of Terminal Alkynes by Base/Cobalt Relay Catalysis
作者:Xufang Liu、Bingxue Liu、Qiang Liu
DOI:10.1002/anie.201916014
日期:2020.4.20
an analogous protocol for alkyne substrates is yet to be developed. Herein, a base and cobalt relay catalytic process for the selective synthesis of (Z)-2-alkenes and conjugated E alkenes by migratory hydrogenation of terminalalkynes is disclosed. Mechanistic studies support a relay catalytic process involving a sequential base-catalyzed isomerization of terminalalkynes and cobalt-catalyzed hydrogenation
Toward Amide-Linked RNA Mimics: Total Synthesis of 3‘-C Branched Uridine Azido Acid via an Ene−Iodolactonization Approach
作者:Eriks Rozners、Yang Liu
DOI:10.1021/ol027229z
日期:2003.1.1
novel synthesis of 3'-C branched uridine azido acid has been accomplished by a sequence of stereoselective ene and iodolactonization reactions. Compared to traditional routes that start from carbohydrates, the present methodology is more flexible and can be further optimized by incorporation of novel future developments of synthetic chemistry. Because the key chemistry does not involve the 3'-C substituent