Regio- and stereoselective 1,2 Wagner-Meerwein shifts during trifluoroacetic acid catalyzed isomerization of unsymmetrically substituted tricyclo[3.2.0.02,4]heptanes
Highly substituted furans from 2-propynyl-1,3-dicarbonyls and organic halides or triflates via the oxypalladation-reductive elimination domino reaction
作者:Antonio Arcadi、Sandro Cacchi、Giancarlo Fabrizi、Fabio Marinelli、Luca M Parisi
DOI:10.1016/s0040-4020(03)00588-x
日期:2003.6
an efficient straightforward entry into highly substituted furans. The best results have been obtained by using an excess of the alkyne. The process can tolerate a wide variety of important functional groups both on the alkyne and the organic halide or triflate. Under an atmosphere of carbonmonoxide, the reaction affords furan derivatives incorporating carbonmonoxide. Depending on the alkyne to organic
Sequential alkylation/transition metal catalysed annulation reactions of 1,3-dicarbonyl compounds with propargyl bromide
作者:Antonio Arcadi、Giorgio Cerichelli、Marco Chiarini、Sabrina Di Giuseppe、Fabio Marinelli
DOI:10.1016/s0040-4039(00)01666-x
日期:2000.11
β-Diketones, β-ketoesters and β-ketonitriles in the presence of propargyl bromide, DBU and a catalytic amount of CuI in toluene give 2,3,5-trisubstituted furans through sequential alkylation/cyclisation/isomerisation reactions.
Synthesis of substituted pyrroles in the glaser reaction
作者:S. A. Vizer、K. B. Yerzhanov、V. M. Dembitsky
DOI:10.1002/hc.20184
日期:——
The substitutedpyrroles and dipyrroles along with diacetylenes and cumulenes have been synthesized in high yields using a new synthetic method under mild reaction conditions using the Glaser coupling reaction. Although diacetylenes are formed from 2-propargyl-1,3-dicarbonyl compounds having electron-donors substituents such as Ph or OEt, only polyfunctional substituted cumulenes are formed from those
Under the acidic conditions, substituted furans were constructed from γ-alkynyl ketones through corresponding allene intermediates in one-pot. The methodology was also tailored to a series of the Ugi reaction products for the synthesis of 6-methylpyrazin-2(1H)-one derivatives. The current method offered significant advantages for the combinatorial applications of these chemical scaffolds.
Iron-catalyzed synthesis of polysubstituted pyrrolesvia [4C+1N] cyclization of 4-acetylenic ketones with primary amines
作者:Yeming Wang、Xihe Bi、Dehua Li、Peiqiu Liao、Yidong Wang、Jin Yang、Qian Zhang、Qun Liu
DOI:10.1039/c0cc03802d
日期:——
A highly efficient iron-catalyzed approach to polysubstituted pyrroles has been developed through the [4C+1N] cyclization of 4-acetylenic ketones with primary amines, leading to the synthesis of a variety of tetra- and fully-substituted pyrroles as well as fused pyrrole derivatives in good to excellent yields.