N,O-Nucleosides from Ene Reactions of Nitrosocarbonyl Intermediates with the 3-Methyl-2-buten-1-ol
摘要:
Nitrosocarbonyl intermediates undergo ene reactions with allylic alcohols, affording regioisomeric adducts in fair yields. Nitrosocarbonyl benzene reacts with 3-methyl-2-buten-1-ol and follows a Markovnikov orientation and abstracts preferentially the twix hydrogens over the lone ones. With the more sterically demanding nitrosocarbonyl mesitylene and anthracene, the Markovnikov directing effect is relieved and lone abstraction is observed, affording the 5-hydroxy-isoxazolidines that serve as synthons for the preparation of N,O-nucleoside analogues according to the Vorbruggen protocol.
Substituted 1,3-oxathiolanes with antiviral properties
申请人:BioChem Pharma, Inc.
公开号:US06369066B1
公开(公告)日:2002-04-09
This invention relates to single enantiomers of novel cis-substituted 1,3-oxathiolanes, of the formula (I):
wherein;
R1 is hydrogen, and R2 is cytosine or 5-fluorocytosine;
and pharmaceutically acceptable salts and esters thereof.
This invention also relates to pharmaceutical compositions containing them and to the use of these compounds as antiviral agents, particularly in combination therapy.
作者:Seongmin Lee、Chayasith Uttamapinant、Gregory L. Verdine
DOI:10.1021/ol702222z
日期:2007.11.1
Various 4'-F nucleosides have been prepared in only two to three steps via sequential bromination and fluorination of ribofuranoses or nucleosides.
通过呋喃核糖或核苷的连续溴化和氟化,仅用两到三个步骤即可制备各种 4'-F 核苷。
A Stereoselective Approach to β-<scp>l</scp>-Arabino Nucleoside Analogues: Synthesis and Cyclization of Acyclic 1′,2′-<i>syn</i><i>N</i>,<i>O</i>-Acetals
作者:Starr Dostie、Michel Prévost、Yvan Guindon
DOI:10.1021/jo3012754
日期:2012.9.7
Reported herein is a novel and versatile strategy for the stereoselectivesynthesis of unnatural β-l-arabinofuranosyl nucleoside analogues from acyclic N,OTMS-acetals bearing pyrimidine and purine bases. These unusual acetals undergo a C1′ to C4′ cyclization where the OTMS of the acetal serves as the nucleophile to generate 2′-oxynucleosides with complete retention of configuration at the C1′ acetal