with readily prepared cobalt or titanium nanoparticles, under mild reaction conditions, led to the obtention of different reductive dimerization products depending on the nature of the transition metal used. Cobalt nanoparticles (CoNPs) allowed the selective transformation of the starting carbonylcompounds into vicinal diols, whereas the reaction promoted by titanium nanoparticles (TiNPs) led to the
[EN] PROCESS FOR THE PREPARATION OF OPTICALLY ACTIVE 1,2-DI(FURAN-2-YL)ETHANE-1,2-DIOLS AND DERIVATES THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE 1,2-DI(FURAN-2-YL)ÉTHANE-1,2-DIOLS OPTIQUEMENT ACTIFS ET DÉRIVÉS DE CEUX-CI
申请人:FUNDACIO INST CATALA D INVESTIGACIO QUIMICA
公开号:WO2013135869A1
公开(公告)日:2013-09-19
The invention relates to a process for the preparation of optically active 1,2-diol of formula (S,S)-(I), or alternatively of formula (R,R)-(I) by asymmetric transfer hydrogenation of a compound of formula (II), or a compound of formula (IV), or mixture thereof using an optically active metal compound as catalyst and a specific hydrogen source.
Truly Catalytic and Enantioselective Pinacol Coupling of Aryl Aldehydes Mediated by Chiral Ti(III) Complexes<sup>†</sup>
作者:A. Chatterjee、T. H. Bennur、N. N. Joshi
DOI:10.1021/jo0342875
日期:2003.7.1
A variety of chiral Ti(IV) complexes were reduced in situ with zinc in acetonitrile. The resulting chiral Ti(III) complexes were found to catalyze the pinacol coupling reaction stereoselectively. The best results were obtained from the Ti-SALEN complex, which was found to be an efficient catalyst at 10 mol % concentration. Various aromatic aldehydes were coupled to obtain chiral hydrobenzoin derivatives
Magnesium‐Induced Pinacol Coupling of Aromatic Aldehydes and Ketones Under Ultrasound Irradiation
作者:Jian‐Sen Wang、Ji‐Tai Li、Zhi‐Ping Lin、Tong‐Shuang Li
DOI:10.1081/scc-200057305
日期:2005.5.1
Abstract The system of magnesium and magnesiumiodide can reduce some aromatic aldehydes and ketones to the corresponding pinacols in good yields within 10–60 min at room temperature under ultrasound irradiation.
MeOH or H 2 O as efficient additive to switch the reactivity of allylSmBr towards carbonyl compounds
作者:Jianyong Li、Qingsheng Niu、Shanchan Li、Yuehao Sun、Qian Zhou、Xin Lv、Xiaoxia Wang
DOI:10.1016/j.tetlet.2017.01.091
日期:2017.3
aryl ketones mediated by Sm/alkyl halide/MeOH. The results demonstrate that the real reducing species in Sm/alkyl halide/MeOH system should be allylSmBr, and MeOH has elegantly switched the reactivity of allylSmBr from being nucleophilic to being good reductive coupling reagent. Besides, H2O was also found to be a useful additive to realize the pinacol coupling of aliphatic aldehydes and ketones promoted