Convenient and stereoselective synthesis of (Z)-1-bromo-1-alkenes by microwave-induced reaction
摘要:
(Z)-l-Bromo-l-alkenes were stereoselectively prepared in high yields in a short reaction time (0.2 1.0 min) by microwave irradiation of the corresponding 2,3-dibromoalkanoic acids in DMF in the presence of triethylamine. (C) 2001 Elsevier Science Ltd. All rights reserved.
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.
Decarboxylative bromination of α,β -unsaturated carboxylic acids via an anodic oxidation
作者:Mei-Xiang Bi、Peng Qian、Yu-Kang Wang、Zheng-Gen Zha、Zhi-Yong Wang
DOI:10.1016/j.cclet.2017.04.030
日期:2017.6
Abstract A novel bromination of α,β-unsaturated carboxylicacids was developed via a decarboxylation by virtue of a direct anodic electro-oxidation. In this method, ammonium bromide was employed as a bromine source and the reaction features transition-metal-free, short time, and no additional supporting electrolyte.
Photocatalytic Isomerization of Styrenyl Halides: Stereodivergent Synthesis of Functionalized Alkenes
作者:Hao Zhang、Qing Xu、Lei Yu、Shouyun Yu
DOI:10.1002/ejoc.201901119
日期:2020.3.15
An efficient and general method for the isomerization of styrenyl halides under photocatalytic conditions is reported. A series of stereospecific transformations constitute preliminary validation of this strategy in the synthesis of functionalized alkenes, including two diaryl alkenes, a styrenyl boronic ester, and an enyne.
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.