One-Pot Three-Component Catalytic Synthesis of Fully Substituted Pyrroles from Readily Available Propargylic Alcohols, 1,3-Dicarbonyl Compounds and Primary Amines
作者:Victorio Cadierno、José Gimeno、Noel Nebra
DOI:10.1002/chem.200701132
日期:——
preparation of fully substituted pyrroles, from readily accessible secondary propargylic alcohols, 1,3-dicarbonylcompounds and primary amines, has been developed. The one-pot multicomponent reaction, which is catalysed by the system [Ru(eta(3)-2-C(3)H(4)Me)(CO)(dppf)][SbF(6)]/CF(3)CO(2)H (dppf: 1,1'-bis(diphenylphosphanyl)ferrocene), involves initial propargylation of the 1,3-dicarbonylcompound promoted by
A metal-free and two-phase protocol for the Meyer-Schuster isomerization of propargyl alcohols to the corresponding α,β-unsaturatedcarbonylcompounds has been achieved in the presence of stoichiometric phosphorous acid aqueous solution, which produces the desired products in high yields with excellent stereoselectivity. Compared with the traditional methods, the procedure features broad scope of the
Terminal allylicalcohols are important motifs in natural products, and also key intermediates/precursors in numerous novel reaction transformations. In this study, enabled by a bifunctional ligand featuring a basic amino group, a gold-catalyzed hydroarylation of terminal unactivated propargylic alcohols with heteroareneboronic acids has been first established, and efficiently affords various terminal
Efficient Synthesis of 3-Chloromethyl-2(5<i>H</i>)-furanones and 3-Chloromethyl- 5,6-dihydropyran-2-ones via the PdCl<sub>2</sub>-Catalyzed Chlorocyclocarbonylation of 2,3- or 3,4-Allenols
作者:Xin Cheng、Xuefeng Jiang、Yihua Yu、Shengming Ma
DOI:10.1021/jo8015677
日期:2008.11.21
was formed between the center carbon atom of the allene moiety and the hydroxyl oxygen, which was established by the X-ray single crystal diffraction study of gamma-lactone 3p. The highly opticallyactive 3-chloromethyl-2(5H)-furanones could be easily prepared from the readily available opticallyactive 2,3-allenols. A mechanism for this reaction was proposed.
Copper-Catalyzed Huisgen 1,3-Dipolar Cycloaddition under Oxidative Conditions: Polymer-Assisted Assembly of 4-Acyl-1-Substituted-1,2,3-Triazoles
作者:Paula M. Diz、Alberto Coelho、Abdelaziz El Maatougui、Jhonny Azuaje、Olga Caamaño、Álvaro Gil、Eddy Sotelo
DOI:10.1021/jo400800j
日期:2013.7.5
We herein document the first example of a reliable copper-catalyzed Huisgen 1,3-dipolar cycloaddition underoxidativeconditions. The combined use of two polymer-supported reagents (polystyrene-1,5,7-triazabicyclo[4,4,0]dec-5-ene/Cu and polystyrene-2-iodoxybenzamide) overcomes the thermodynamic instability of copper(I) species toward oxidation, enabling the reliable Cu-catalyzed Huisgen 1,3-dipolar