Pivaloyl-protected glucosyl iodide as a glucosyl donor for the preparation of β-C-glucosides
作者:Virginia V. Triantakonstanti、Alexandros Toskas、Nicolaos S. Iordanidis、Thanos Andreou、Theoharis V. Koftis、John K. Gallos
DOI:10.1016/j.tetlet.2020.152173
日期:2020.7
A method for the selective synthesis of β-C-glucosides using α-D-tetra-O-pivaloylglucosyl iodide as a glucosyl donor is reported. Its diastereoselectivity differs from that of the respective acetyl-protected glucosyl bromide, as it reported in the literature under similar reaction conditions. The concentration of the catalyst, the solvent and the type of additive used are crucial factors that determine
<i>Cine</i> Substitution with Arylzinc Reagents: Scope and Mechanistic Studies
作者:Santiago Barroso、Sébastien Lemaire、Vittorio Farina、Andreas K. Steib、Romain Blanc、Paul Knochel
DOI:10.1021/acs.joc.6b00074
日期:2016.4.1
of arylzinc reagents bearing electron-donating substituents to react in a Friedel–Crafts fashion (cine) with electrophiles like perpivaloylated glucoside bromide and benzhydryl bromides in competition with organometalliccoupling (ipso) is shown. The stereoelectronic factors required to promote the cine reactivity versus the classical ipso, and the mechanism of this alternative pathway, have been investigated
Exploiting Synergistic Effects in Organozinc Chemistry for Direct Stereoselective C‐Glycosylation Reactions at Room Temperature
作者:Alberto Hernán‐Gómez、Samantha A. Orr、Marina Uzelac、Alan R. Kennedy、Santiago Barroso、Xavier Jusseau、Sébastien Lemaire、Vittorio Farina、Eva Hevia
DOI:10.1002/anie.201805758
日期:2018.8.13
Pairing a range of bis(aryl) zincreagents ZnAr2 with the stronger Lewis acidic [(ZnArF2)] (ArF=C6F5), enables highly stereoselective cross‐coupling between glycosyl bromides and ZnAr2 without the use of a transition metal. Reactions occur at room temperature with excellent levels of stereoselectivity, where ZnArF2 acts as a non‐coupling partner although its presence is crucial for the execution of
将一系列双(芳基)锌试剂ZnAr 2与较强的路易斯酸性[(ZnAr F 2)](Ar F = C 6 F 5)配对,可实现糖基溴化物与ZnAr 2之间高度立体选择性的交叉偶联,而无需使用过渡金属。反应在室温下以极好的立体选择性发生,其中ZnAr F 2充当非偶联配偶体,尽管它的存在对于执行C(sp 2)–C(sp 3)键的形成过程。机理研究发现两种锌试剂之间存在独特的协同关系,从而避免了对过渡金属催化或强制反应条件的需求。偶联成功的关键是避免使用相对于二芳基锌化合物(例如THF)的路易斯碱的溶剂。
US9174971B2
申请人:——
公开号:US9174971B2
公开(公告)日:2015-11-03
PROCESS FOR THE PREPARATION OF COMPOUNDS USEFUL AS INHIBITORS OF SGLT2
申请人:FARINA Vittorio
公开号:US20110087017A1
公开(公告)日:2011-04-14
The present invention is directed to a novel process for the preparation of compounds having inhibitory activity against sodium-dependent glucose transporter (SGLT) being present in the intestine or kidney.