An Improved Transient Method for the Synthesis ofN-Benzoylated Nucleosides
摘要:
The Jones' transient method for the synthesis of N-benzoylated nucleosides is improved by reducing the amounts of chlorotrimethylsilane (TMSCI) and benzoyl chloride to nearly equivalent quantities. The easy work-up and high yields of products are the major advantages of this approach. Jones' method is further simplified by omitting the addition of ammonium hydroxide. The utility of this modification for the preparation of some useful protected nucleosides is also presented.
An Improved Transient Method for the Synthesis ofN-Benzoylated Nucleosides
摘要:
The Jones' transient method for the synthesis of N-benzoylated nucleosides is improved by reducing the amounts of chlorotrimethylsilane (TMSCI) and benzoyl chloride to nearly equivalent quantities. The easy work-up and high yields of products are the major advantages of this approach. Jones' method is further simplified by omitting the addition of ammonium hydroxide. The utility of this modification for the preparation of some useful protected nucleosides is also presented.
Design, synthesis, and antiviral properties of 4′-substituted ribonucleosides as inhibitors of hepatitis C virus replication: The discovery of R1479
作者:David B. Smith、Joseph A. Martin、Klaus Klumpp、Stewart J. Baker、Peter A. Blomgren、Rene Devos、Caroline Granycome、Julie Hang、Christopher J. Hobbs、Wen-Rong Jiang、Carl Laxton、Sophie Le Pogam、Vincent Leveque、Han Ma、Graham Maile、John H. Merrett、Arkadius Pichota、Keshab Sarma、Mark Smith、Steven Swallow、Julian Symons、David Vesey、Isabel Najera、Nick Cammack
DOI:10.1016/j.bmcl.2007.02.004
日期:2007.5
A series of 4'-substituted ribonucleoside derivatives has been prepared and evaluated for inhibition of hepatitis C virus (HCV) RNAreplication in cell culture. The most potent and non-cytotoxic derivative was compound 28 (4'-azidocytidine, R1479) with an IC(50) of 1.28 microM in the HCV replicon system. The triphosphate of compound 28 was prepared and shown to be an inhibitor of RNA synthesis mediated