The photoamination of 1-arylalka-1,3-dienes 1a–f and
1-aryl-4-phenylbuta-1,3-dienes 1g–k with NH3 in the
presence of p-dicyanobenzene (DCB) gives 4-amino-1-arylalk-2-enes
2a–f and 1-amino-1,4-diarylbut-2-enes 2g–k, respectively. The
photoamination proceeds by nucleophilic addition of NH3 to the
cation radicals of 1+˙ generated by photoinduced
electron transfer to DCB. The regiochemistry of 2 is related to the
distribution of the positive charge in 1+˙ calculated
by the PM3-UHF/RHF method, the stability of the aminated radicals formed by
the addition of NH3 to 1+˙ and the
stability of the aminated anion formed by the reduction of the aminated
radicals by DCB-˙. The stabilities of these
intermediates are estimated by the calculation of the heat of formation by
the PM3-UHF/RHF method. Distributions of the positive charge in
1+˙ and the stabilities of the aminated anion show a
good agreement with the product analysis.
A Versatile Catalyst for Heck Reactions of Aryl Chlorides and Aryl Bromides under Mild Conditions
作者:Adam F. Littke、Gregory C. Fu
DOI:10.1021/ja010988c
日期:2001.7.1
for Heck reactions of arylchlorides and bromides. A sterically and electronically diverse array of aryl bromides, as well as activated arylchlorides, couple with a range of mono- and disubstituted olefins at room temperature, furnishing the arylated product with high E/Z stereoselection. The corresponding reactions of a broad spectrum of electron-neutral and electron-rich arylchlorides proceed at
Chemoselective Construction of Substituted Conjugated Dienes Using an Olefin Cross-Metathesis Protocol
作者:Timothy W. Funk、Jon Efskind、Robert H. Grubbs
DOI:10.1021/ol047929z
日期:2005.1.1
[Reaction: see text] Various substituted conjugateddienes have been made by olefin cross-metathesis. Using either electronic or steric "protection," one of the olefins of the conjugateddiene was deactivated relative to the other for cross-metathesis. The reactions proceed with very high chemoselectivity and, when steric deactivation is used, very high diastereoselectivity.
Ligand-Free Iron-Catalyzed Carbon(sp<sup>2</sup>)–Carbon(sp<sup>2</sup>) Cross-Coupling of Alkenyllithium with Vinyl Halides
作者:Qiang Liu、Zhi-Yong Wang、Xiao-Shui Peng、Henry N. C. Wong
DOI:10.1021/acs.joc.8b00510
日期:2018.6.15
An efficient ligand-free iron-catalyzedcross-couplingreaction involving alkenyllithium and vinyl iodides was developed to form diene species in moderate to good yields. This new iron-catalyzedcross-couplingreaction provides a mild, inexpensive, and environmentally friendly avenue toward synthesis of diversified diene derivatives.