Undirected Arene and Chelate-Assisted Olefin C-H Bond Activation: [Rh<sup>III</sup>Cp*]-Catalyzed Dehydrogenative Alkene-Arene Coupling as a New Pathway for the Selective Synthesis of Highly Substituted<i>Z</i>Olefins
作者:Joanna Wencel-Delord、Corinna Nimphius、Frederic W. Patureau、Frank Glorius
DOI:10.1002/asia.201101018
日期:2012.6
Undirected/Directed Cross‐Coupling: A new dehydrogenative RhIII‐catalyzed cross‐coupling reaction between bromoarenes bearing no directing group and vinylic substrates substituted by a chelating group is reported. An original reaction mechanism enables the use of internal alkenes in a Z‐selective coupling. The application of 1,3‐disubstituted or 1,2‐homodisubstituted arenes leads to the formation of highly functionalized
Oxidative coupling of alkenes with amides using peroxides: selective amide C(sp<sup>3</sup>)–H versus C(sp<sup>2</sup>)–H functionalization
作者:Xu-Heng Yang、Wen-Ting Wei、Hai-Bing Li、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c4cc05051g
日期:——
described, in which mono- and difunctionalization of alkenes are selectively achieved. In this reaction with amides, the chemoselectivity toward the functionalization of the C(sp(3))-Hbonds adjacent to the nitrogen atom or the functionalization of the carbonyl C(sp(2))-Hbonds across alkenes relies on the reaction conditions.
Stereoselective Synthesis of Polysubstituted Alkenes through a Phosphine-Mediated Three-Component System of Aldehydes, α-Halo Carbonyl Compounds, and Terminal Alkenes
作者:Da-Neng Liu、Shi-Kai Tian
DOI:10.1002/chem.200900177
日期:2009.4.27
mediate the one‐pot Wittig reaction of aldehydes with α‐halo carbonylcompounds for the synthesis of 1,2‐disubstituted and trisubstituted alkenes in an excellent stereoselective fashion. Furthermore, the first one‐pot, three‐component reaction of aldehydes, α‐halo acetates, and terminalalkenes has been developed in the presence of PPh3 to produce trisubstituted alkenes with excellent E selectivity (see
A stereocontrolled approach to electrophilic epoxides
作者:Otto Meth-Cohn、Clive Moore、Heinrich C. Taljaard
DOI:10.1039/p19880002663
日期:——
Lithium t-butyl hydroperoxide (easily generated by addition of an alkyl-lithium to anhydrous t-butyl hydroperoxide in THF solution) is a powerful reagent for the epoxidation of electrophilic alkenes at –20 to 0 °C under full stereocontrol.
A facile and convenient protocol for the synthesis of cinnamides from cinnamic acids and tetraalkylthiuram disulfides under metal and additive free conditions has been achieved. This method allows the efficient coupling of diverse cinnamic acids with tetraalkylthiuram disulfides through a simply mixing operation.