报道了一种实用简单且有用的方法,通过布朗斯台德酸催化活化源自醇的邻-[1-(对-MeO苯基)乙烯基]苯甲酸酯(PMPVB)供体来合成醚和硫醚。作用机制基于活性烯烃的远程活化,然后进行分子内 5-外触发环化,产生反应性中间体,该中间体可以通过底物依赖性 S N 1 或 S N 2 机制与醇和硫醇亲核试剂反应,从而提供容易的反应。分别获得醚和硫醚官能团。
Electrochemical synthesis of glycoconjugates of 3β-hydroxy-Δ5-steroids by using non-activated sugars and steroidal thioethers
作者:Aneta M. Tomkiel、Krzysztof Brzezinski、Zenon Łotowski、Leszek Siergiejczyk、Piotr Wałejko、Stanisław Witkowski、Jan Kowalski、Jolanta Płoszyńska、Andrzej Sobkowiak、Jacek W. Morzycki
DOI:10.1016/j.tet.2013.07.106
日期:2013.10
electrochemical synthesis of glycoconjugates is presented. Thioether derivatives of cholesterol and other sterols were subjected to anodic oxidation in the presence of a sugar alcohol affording glycoconjugates with the sugar linked to a steroid moiety by an ether bond. The isomeric 6β-3α,5α-cyclo-steroidal thioethers proved to be better sterol donors than the normal 3β-Δ5-steroidal thioethers.
Copper‐Catalyzed Electrophilic Thiolation of Organozinc Halides by Using
<i>N</i>
‐Thiophthalimides Leading to Polyfunctional Thioethers
作者:Simon Graßl、Clémence Hamze、Thaddäus J. Koller、Paul Knochel
DOI:10.1002/chem.201806261
日期:2019.3.12
(Hetero)aryl, benzylic, and alkyl zinc halides were thiolated with N‐thiophthalimides at 25 °C within 1 h in the presence of 5–10 % Cu(OAc)2⋅H2O to furnish the corresponding polyfunctionalized thioethers in good yields. This electrophilic thiolation was extended to the introduction of trifluoromethylthio (SCF3), thiocyanate (SCN), and selenophenyl (SePh) groups. The utility of this method was shown
A Strain-Promoted Divergent Chemical Steroidation Unveils Potent Anti-Inflammatory Pseudo-Steroidal Glycosides
作者:Han Ding、Xiao-Lin Zhang、Aoxin Guo、Qian Ping Lee、Chao Cai、Ming Li、Hongzhi Cao、Xue-Wei Liu
DOI:10.1021/jacs.4c00537
日期:2024.5.1
of the regioselectivity, underlying an acceptor-dependent steroidation mode. This approach can be readily extended to the etherification of sugaralcohols to enable the achievement of a diversity-oriented, pipeline-like synthesis of pseudo-steroidal glycosides in good to excellent yields with complete stereo- and regiospecific control for anti-inflammatory agent discovery. Immunological studies have
Electrochemical synthesis of glycoconjugates from activated sterol derivatives
作者:Aneta M. Tomkiel、Jan Kowalski、Jolanta Płoszyńska、Leszek Siergiejczyk、Zenon Łotowski、Andrzej Sobkowiak、Jacek W. Morzycki
DOI:10.1016/j.steroids.2014.01.007
日期:2014.4
Several derivatives of cholesterol and other 3 beta-hydroxy-Delta(5)-steroids were prepared and tested as sterol donors in electrochemical reactions with sugar alcohols. The reactions afforded glycoconjugates with sugar linked to a steroid moiety by an ether bond. Readily available sterol diphenylphosphates yielding up to 54% of the desired glycoconjugate were found to be the best sterol donors. (C) 2014 Elsevier Inc. All rights reserved.
Shoppee et al., Journal of the Chemical Society, 1956, p. 4817,4820