描述了钒氨基三酚盐催化邻位二醇的好氧氧化CC键裂解。我们的结果表明,在空气或氧气气氛下,可以使用多种乙二醇(环状或直链,具有芳族或脂肪族取代基)在不同溶剂中进行C-C键裂解,从而提供具有高化学选择性的相应羰基衍生物。可以在低至10 ppm的催化剂下达到TON达到81,000和TOF达到4150 h -1的情况下进行反应。还提出了通过密度泛函理论计算合理化的反应机理。
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
The present invention is directed to a monomer useful in preparing therapeutic compounds. The monomer includes one or more pharmacophores which potentially binds to a target molecule with a dissociation constant of less than 300 μM and a linker element connected to the pharmacophore. The linker element has a molecular weight less than 500 daltons, is connected, directly or indirectly through a connector, to the pharmacophore.
Oxidation of Vicinal Diols to α-Hydroxy Ketones with H<sub>2</sub>
O<sub>2</sub>
and a Simple Manganese Catalyst
作者:Francesco Mecozzi、Jia Jia Dong、Pattama Saisaha、Wesley R. Browne
DOI:10.1002/ejoc.201701314
日期:2017.12.15
show that oxidation of vic‐diols to α‐hydroxy ketones with H2O2 can be achieved with an in situ prepared catalyst based on manganese salts and pyridine‐2‐carboxylic acid. Furthermore the same catalyst is effective in alkeneepoxidation, and it is shown that alkeneoxidation with the MnII catalyst and H2O2 followed by Lewis acid ring opening of the epoxide and subsequent oxidation of the alkene to α‐hydroxy
Benzylidene acetals of 1,2- and 1,3-glycols are easily cleft by diisobutylaluminumhydride in a toluene solution at 0 °C–room temperature to give the corresponding monobenzyl ethers of the glycols. In general the reaction proceeds excellently in regioselective manner depending on the stereochemical environment.
1,2- 和 1,3- 乙二醇的亚苄基缩醛很容易被二异丁基氢化铝在甲苯溶液中在 0 °C - 室温下裂解,得到相应的乙二醇单苄基醚。通常,该反应根据立体化学环境以区域选择性方式出色地进行。
Oxidative cleavage of vicinal diols: IBX can do what Dess–Martin periodinane (DMP) can
from the results observed with strained and sterically hindered syn 1,2-diols, which undergo oxidative cleavage via a 12-I-5 spirobicyclic periodinane. The use of TFA, a protonating solvent, promotes the formation of the 12-I-5 intermediate for 1,2-diols of all types (sec,sec, sec,tert and tert,tert), leading to efficient oxidative fragmentation.