Saegusa Oxidation of Enol Ethers at Extremely Low Pd-Catalyst Loadings under Ligand-free and Aqueous Conditions: Insight into the Pd(II)/Cu(II)-Catalyst System
作者:Quan Zhu、Yunsong Luo、Yongyan Guo、Yushun Zhang、Yunhai Tao
DOI:10.1021/acs.joc.0c02987
日期:2021.4.16
system of Saegusa oxidation, which converts enolethers to the corresponding enals with a number of diverse substrates at extremely low catalyst loadings (500 mol ppm) under ligand-free and aqueous conditions, is described. Its synthetic utility was demonstrated by large-scale applications of the catalyst system to important nature molecules. This work allows Saegusa oxidation to become a highly practical
Multicatalytic Stereoselective Synthesis of Highly Substituted Alkenes by Sequential Isomerization/Cross-Coupling Reactions
作者:Ciro Romano、Clément Mazet
DOI:10.1021/jacs.8b02134
日期:2018.4.4
patterns to deliver products with high control of the newly generated C═C bond. A highlyenantioselective variant of this [Ir/Ni] sequence has been established using a chiral iridium precatalyst. A complementary [Pd/Ni] catalytic sequence has been optimized for alkenyl methyl ethers with a remote C═C bond. The final alkenes were isolated with a lower level of stereocontrol. Upon proper choice of the Grignard
as an equivalent of the homoenolate anion CH3-CHCH2CHO in reaction with acyl chlorides, the non-substituted α-ethoxyallyltributyltin could not be employed in this way. γ-Methoxyvinyltins, easily prepared by hydrostannation of propargylic ethers, are successfully employed as synthetic equivalents of the homoenolate anions-CH2CH2CHO and -CH2CH2COCH3 in reactions with acyl chlorides. A silylated γ-methoxyvinyltin
determination of synthetic outcomes of photochemical and electrochemical reactions. Herein, we report dispersed TiO2 nanoparticles in combination with methoxybenzene to be a unique heterogeneous photocatalyst for facilitating the formation of novel cyclobutanes. Although the mechanistic details are as yet unclear, the results described herein imply that methoxybenzene is adsorbed onto the TiO2 surface,
分子间和分子内的电子转移都是决定光化学和电化学反应合成结果的关键。在此,我们报道了分散的 TiO 2纳米粒子与甲氧基苯的结合是一种独特的多相光催化剂,可促进新型环丁烷的形成。尽管机制细节尚不清楚,但本文描述的结果表明甲氧基苯被吸附到 TiO 2表面,靠近形成的环丁烷自由基阳离子,以实现物种之间的假分子内电子转移。
Palladium-catalyzed reaction of organoalanes and organozincs with .alpha.,.beta.-unsaturated acetals and orthoesters as conjugate addition equivalents