Aldehyde effect and ligand discovery in Ru-catalyzed dehydrogenative cross-coupling of alcohols to esters
作者:Xiaolin Jiang、Jiahui Zhang、Dongmei Zhao、Yuehui Li
DOI:10.1039/c8cc10315a
日期:——
ligands for dehydrogenation of alcohols. Accordingly, hybrid multi-dentate ligands were discovered based on an oxygen-transfer alkylation of PNP ligands by aldehydes. The relevant Ru-PNN(PO) system provided the desired unsymmetrical esters in good yields via acceptorless dehydrogenation of alcohols. Hydrogen bonding interactions between the phosphine oxide moieties and alcohol substrates likely assisted
Formamides as Lewis Base Catalysts in S<sub>N</sub>Reactions-Efficient Transformation of Alcohols into Chlorides, Amines, and Ethers
作者:Peter H. Huy、Sebastian Motsch、Sarah M. Kappler
DOI:10.1002/anie.201604921
日期:2016.8.16
and waste‐balance (E‐factor down to 2). Chiral substrates are converted with excellent levels of stereochemical inversion (99 %→≥95 % ee). In a practical one‐pot procedure, the primary formed chlorides can be further transformed into amines, azides, ethers, sulfides, and nitriles. The value of the method was demonstrated in straightforward syntheses of the drugs rac‐Clopidogrel and S‐Fendiline.
An<i>in situ</i>Generated Ruthenium Catalyst for the Tishchenko Reaction
作者:Marc-Olivier Simon、Sylvain Darses
DOI:10.1002/adsc.200900701
日期:2010.2.15
A simple and efficient catalytic system for the selective dimerization of aldehydes, the Tishchenkoreaction, is described. High yields of symmetrical esters were generally achieved using an in situ generated rutheniumcatalyst in association with the electron-rich and hindered cyclohexyl(diphenyl)phosphane (CyPPh2) ligand.
Manganese Pincer Complexes for the Base-Free, Acceptorless Dehydrogenative Coupling of Alcohols to Esters: Development, Scope, and Understanding
作者:Duc Hanh Nguyen、Xavier Trivelli、Frédéric Capet、Jean-François Paul、Franck Dumeignil、Régis M. Gauvin
DOI:10.1021/acscatal.6b03554
日期:2017.3.3
related ruthenium and iron PNPcatalysts, the dehydrogenation results from cycling between the amido and amino-hydride forms of the PNP-Mn(CO)2 scaffold. For the dehydrogenation of alcohols into aldehydes, our results suggest that the highest energy barrier corresponds to the hydrogen release from the amino-hydride form, although its value is close to that of the outer-sphere dehydrogenation of the
An unprecedented synergistic effect, obtained for rationally designed AuâPd alloy nanoparticles supported on an acidic metalâorganic framework (MOF), in the aerobic oxidation of the primary CâH bonds in toluene and derivates is reported.