NaBH<sub>3</sub>CN: A Janus Substitute for Tin-Free Radical-Based Reactions
作者:Julie Guiard、Yaniss Rahali、Jean-Pierre Praly
DOI:10.1002/ejoc.201402441
日期:2014.7
depending on the conditions, either by reductive cyclization or atom-transfer radicalcyclization. A related cyclization occurred upon using Cu(OAc)2. This and other assays showed the reduction by NaBH3CN of CuII salts, either added or formed in situ. Having both ionic and radical reactivity, NaBH3CN appears as a Janus reagent that may be useful for tin-freeradical chemistry under mild and very simple
除了表明如果溴/碘糖用 NaBH3CN 和 2,2"-偶氮二异丁腈处理时热自由基反应(还原、Giese 反应)是有效的,我们还探索了基于 CuI 盐(≤0.5 当量)的新引发条件。通过一组从有机溴化物产生自由基。这已得到证实,因为在惰性气氛下,乙酰溴葡萄糖在约 50 °C 被还原为重排的 2-脱氧葡萄糖,并且随着 N-烯丙基 α-溴酰胺反应,取决于条件,通过还原环化或原子转移自由基环化。使用 Cu(OAc)2 时会发生相关的环化反应。该试验和其他试验表明,添加或原位形成的 CuII 盐被 NaBH3CN 还原。具有离子和自由基两种反应性,
PROCESS FOR PREPARING FONDAPARINUX SODIUM AND INTERMEDIATES USEFUL IN THE SYNTHESIS THEREOF
申请人:Nadji Sourena
公开号:US20110105418A1
公开(公告)日:2011-05-05
Processes for the synthesis of the Factor Xa anticoagulent Fondaparinux, and related compounds are described. Also described are protected pentasaccharide intermediates as well as efficient and scalable processes for the industrial scale production of Fondaparinux sodium by conversion of the protected pentasaccharide intermediates via a sequence of deprotection and sulfonation reactions.
1,2-<i>Trans</i>-Selective Synthesis of Glycosyl Boranophosphates and Their Utility as Building Blocks for the Synthesis of Phosphodiester-Linked Disaccharides
is controlled by neighboring group participation. The resultant glycosyl boranophosphate triesters were converted into the corresponding boranophosphate diesters and condensed with appropriately protected monosaccharides to give disaccharides linked with an anomeric boranophosphate linkage. Furthermore, the disaccharides worked as precursors of the corresponding phosphodiester-linked disaccharides