Deoxygenation of cis vicinal diols to make didehydro dideoxy
申请人:Terochem Laboratories Limited
公开号:US05410033A1
公开(公告)日:1995-04-25
Cis vicinal diols are converted to olefins using tellurides or selenide reagents. The diol is reacted to convert the hydroxyl groups into good leaving groups for nucleophilic substitution. Alkyl and aryl sulfonate groups such as mesylate or tosylate are preferred. The product is then reacted with a source of Te.sup.2- or Se.sup.2- ions, preferably an alkali metal telluride or selenide, to form the desired olefin. The process is particularly useful for generating 2',3'-unsaturation in the sugar moiety of nucleosides. Novel intermediate mesylate, tosylate and olefin derivatives of nucleosides are also provided.
[EN] DEOXYGENATION OF CIS VICINAL DIOLS<br/>[FR] DESOXYGENATION DE DIOLS CIS VOISINS
申请人:TEROCHEM LABORATORIES LIMITED
公开号:WO1994018214A1
公开(公告)日:1994-08-18
(EN) Cis vicinal diols are converted to olefins using tellurides or selenide reagents. The diol is reacted to convert the hydroxyl groups into good leaving groups for nucleophilic substitution. Alkyl and aryl sulfonate groups such as mesylate or tosylate are preferred. The product is then reacted with a source of Te2- or Se2- ions, preferably an alkali metal telluride or selenide, to form the desired olefin. The process is particularly useful for generating 2',3'- unsaturation in the sugar moiety of nucleosides. Novel intermediate mesylate, tosylate and olefin derivatives of nucleosides are also provided.(FR) Des diols cisvoisins sont convertis en oléfines à l'aide de tellurure ou de réactifs de séléniure. On fait réagir le diol pour convertir les groupes hydroxyle en bons groupes labiles en vue d'une substitution nucléophile. Les groupes alkyle et aryle sulfonate tels que mésylate ou toxylate sont préférés. On fait ensuite réagir le produit avec une source d'ions Te2- ou Se2-, de préférence un tellurure ou un séléniure de métaux alcalins pour produire l'oléfine désirée. Le procédé est utile notamment pour générer une insaturation 2',3' dans la fraction de sucre de nucléosides. De nouveaux dérivés intermédiaires de mésylate, tosylate et d'oléfine de nucléosides sont également décrits.
Synthesis of 2‘,3‘-Didehydro-2‘,3‘-dideoxynucleosides by Reaction of 5‘-Protected Nucleoside 2‘,3‘-Dimesylates with Telluride Dianion: A General Route from <i>Cis</i> Vicinal Diols to Olefins
作者:Derrick L. J. Clive、Philip L. Wickens、Paulo W. M. Sgarbi
DOI:10.1021/jo9610570
日期:1996.1.1
treatment with telluride dianion in the form of the sodium or lithium salt. The method is well-suited to the preparation of unsaturated nucleosides that can be converted into compounds that are believed to be useful in the treatment of AIDS. The deoxygenation is general for vicinal dimesylates that have, or may adopt, a synperiplanar conformation. With straight chain compounds the reaction is stereospecific