Palladium-catalyzed [2+1+1] annulation of norbornenes with (z)-bromostyrenes: synthesis of bismethylenecyclobutanes via twofold C(sp<sup>2</sup>)–H bond activation
作者:Jiangang Mao、Weiliang Bao
DOI:10.1039/c4cc06545j
日期:——
The first Pd-catalyzed intermolecular [2+1+1] annulation reaction of (Z)-bromostyrene derivatives and norbornenes has been realized. Bismethylenecyclobutane derivatives were obtained with high yields. The domino coupling reaction involves a double Heck-type coupling process, twofold C(sp(2))-H bond activation and formation of three carbon-carbon bonds.
Palladium(0)-Catalyzed Methylcyclopropanation of Norbornenes with Vinyl Bromides and Mechanism Study
作者:Jiangang Mao、Hujun Xie、Weiliang Bao
DOI:10.1021/acs.orglett.5b01603
日期:2015.8.7
cycloadditions of vinyl bromides to norbornenes catalyzed by Pd(OAc)2/PPh3 in the presence of CH3ONa and CH3OH has been established. A methylcyclopropane subunit was installed by a 3-fold domino procedure involving a key protonation course. Preliminary deuterium-labeling studies revealed that the proton came from methyl of CH3OH and also exposed an additional hydrogen/deuterium exchange process. These two
Palladium(0)-Catalyzed Methylenecyclopropanation of Norbornenes with Vinyl Bromides
作者:Jiangang Mao、Weiliang Bao
DOI:10.1021/ol500829t
日期:2014.5.16
Highly strained methylenecyclopropane derivatives have been achieved via a novel and efficient Pd(0)-catalyzed domino reaction. The formal [2 + 1] cycloaddition reaction of vinyl bromides to norbornenes involves a Heck-type coupling and a C(sp2)–H bond activation.
Palladium-Catalyzed Two-Component Domino Coupling Reaction of (<i>Z</i>)-β-Bromostyrenes with Norbornenes: Synthesis of 1,5-Enynes
作者:Jiangang Mao、Huifang Li、Herui Wen、Min Li、Xiaolin Fan、Weiliang Bao
DOI:10.1002/adsc.201500865
日期:2016.6.16
have been achieved via a palladium(0)‐catalyzeddominocoupling reaction of (Z)‐β‐bromostyrenes with norbornenes in the presence of cesium carbonate and N,N‐dimethylformamide. The process involves a double Heck‐type procedure, two‐fold C(sp2)H activation and formation of two carbon‐carbon bonds. There are possibilities of diversified transformation for the dominocoupling of (Z)‐β‐bromostyrenes with
A concise and highly efficient synthesis method of direct esterification of aldehydes via Pd-catalyzed C–H bond activation of aldehyde group has been developed. The strategy avoids the preoxidation step of aldehyde or use of condensing agents in ester synthesis, which is not only applicable to various alcohols but also suitable for the esterification of phenolics which are usually difficult to be esterified