Nickel-Catalyzed [3+2+2] Cycloadditions between Alkynylidenecyclopropanes and Activated Alkenes
作者:Lucía Saya、Gaurav Bhargava、Miguel A. Navarro、Moises Gulías、Fernando López、Israel Fernández、Luis Castedo、José L. Mascareñas
DOI:10.1002/anie.201004438
日期:2010.12.17
Now with nickel: [3C+2C+2C] cycloadditions involving non‐activated alkylidenecyclopropanes provide a practical entry to a variety of interesting 6,7‐fused bicyclic systems (see scheme; cod=1,5‐cyclooctadiene). DFT calculations, combined with experimental data, suggest that the catalytic cycle involves the initial formation of 1‐alkylidenenickelacyclobutane intermediates, such as 1.
A Ni‐catalyzed [2+2+2] cycloaddition reaction between allene‐ynes and various mono‐, di‐ and tri‐substituted allenes is described. This protocol effectively differentiates allenyl π components and shows broad substrate generality to give highly functionalized carbocycles. A DFT study played a key role in revealing a detailed reaction mechanism that controls site‐, regio‐ and stereoselectivity, which
In-MEDIATED ALLYLATION OF α-KETO ESTERS WITH ALLYL HALIDES<sup>*</sup>
作者:Phil Ho Lee、Kooyeon Lee、Sukbok Chang
DOI:10.1081/scc-100105896
日期:2001.1
The chemoselective reaction of α-keto esters with allyl halides, propargyl bromides, and allenyl bromide using indium metal afforded α-hydroxy-γ,δ-unsaturated esters in good to excellent yields under mild conditions. *This paper is dedicated to Professor Chang Hwan Rhee on the occasion of his 60th birthday.
Formation of Bicyclic Pyrroles and Furans Through an Enone Allene Photocycloaddition and Fragmentation Sequence
作者:Ginger Lutteke、Rana AlHussainy、Pauli J. Wrigstedt、B. T. B. Hue、René de Gelder、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/ejoc.200701017
日期:2008.2
acetonitrile at 300 nm resulted in the clean conversion of the starting materials into a mixture of photoproducts. The major product in all cases was a bicyclic pyrrole or furan fused to an eight membered ring (43–70 % yield). The formation of these products is thought to be a result of a heteroatom-induced fragmentation of the straight adduct (7). This is supported by irradiation of the carbon analogue
Synthesis and monoamine uptake inhibition of conformationally constrained 2β-carbomethoxy-3β-phenyl tropanes
作者:Patrick Johannes Riss、René Hummerich、Patrick Schloss
DOI:10.1039/b902863c
日期:——
A series of 2β-carbomethoxy-3β-phenyl tropanes with conformationally constrained nitrogen substituents were synthesized as potential selective dopamine transporter ligands. These novel compounds were examined for their monoamine uptake inhibition potency at the human dopamine transporter (hDAT), the human serotonin transporter (hSERT) and the human noradrenalin transporter (hNET), stably expressed