One-Flow, Multistep Synthesis of Nucleosides by Brønsted Acid-Catalyzed Glycosylation
作者:Adam Sniady、Matthew W. Bedore、Timothy F. Jamison
DOI:10.1002/anie.201006440
日期:2011.2.25
Nucleosides in flow: A general, scalable method of Brønsted acid‐catalyzed nucleoside formation is described. Because of the high reaction temperatures readily available to the flow reaction format, mild Brønsted acids, particularly pyridinium triflates, can be used. A one‐flow multistepsynthesis of unprotected nucleosides is also reported (see scheme).
PHOSPHORAMIDITES FOR SYNTHETIC RNA IN THE REVERSE DIRECTION, EFFICIENT RNA SYNTHESIS AND CONVENIENT INTRODUCTION OF 3'-END LIGANDS, CHROMOPHORES AND MODIFICATIONS OF SYNTHETIC RNA
申请人:Srivastava Suresh C.
公开号:US20110137010A1
公开(公告)日:2011-06-09
The present invention provides building blocks and methods for synthesizing very pure RNA in a form that can efficiently be modified at the 3′ end. Reverse RNA monomer phosphoramidites have been developed for RNA synthesis in 5′→3′ direction, leading to very clean oligo synthesis that allows for the introduction of various modifications at the 3′-end cleanly and efficiently. Higher coupling efficiency per step have been observed during automated oligo synthesis with the reverse RNA amidites disclosed herein, resulting in a greater ability to achieve higher purity and produce very long oligonucleotides. The use of the reverse RNA phosphoramidites in the synthetic process of this invention leads to oligonucleotides free of N+1 species.