Regioselective Synthesis of <i>N</i><sup>2</sup>-Aryl 1,2,3-Triazoles via Electro-oxidative Coupling of Enamines and Aryldiazonium Salts
作者:Mrinmay Baidya、Samrat Mallick、Suman De Sarkar
DOI:10.1021/acs.orglett.1c04099
日期:2022.2.18
An efficient syntheticroute for the construction of N2-aryl 1,2,3-triazoles is reported via sequential C–N bond formation and electro-oxidative N–N coupling under metal-free conditions. Readily accessible 2-aminoacrylates and aryldiazonium salts were used as starting materials, and the developed protocol displays excellent functional group tolerance, allowing an extensive range of substrate scope
Synthesis of highly substituted pyrroles via oxidative free radical reactions of β-aminocinnamates
作者:An-I Tsai、Che-Ping Chuang
DOI:10.1016/j.tet.2005.12.011
日期:2006.3
reactions of β-aminocinnamates are described. Imine radicals produced by tetra-n-butylammonium cerium(IV) nitrate (TBACN) oxidation of enamines undergo efficient addition to the C–C double bond of β-aminocinnamates. This TBACN mediated free radical reaction between β-aminocinnamates and enamines provides a novel method for the synthesis of highly substitutedpyrroles. The direct TBACN oxidation of β-aminocinnamates
Method for producing an optically activ beta-amino acid
申请人:——
公开号:US20040023344A1
公开(公告)日:2004-02-05
The Problem to Be Solved:
To provide a producing method of an optically active &bgr;-amino acid useful as intermediate for the production of medicines, agricultural chemicals and physiologically active substances, by means of a catalytic and asymmetric synthesis method of high performance and a high enantiomeric excess, without requiring additional procedures such as introduction and removal of protecting group and so on.
Means to Solve the Problems:
A producing method of an optically active &bgr;-amino acids which comprises subjecting an enamine to an asymmetric hydrogenation.
CuI-catalyzed synthesis of multisubstituted pyrido[1,2-<i>a</i>]pyrimidin-4-ones through tandem Ullmann-type C–N cross-coupling and intramolecular amidation reaction
作者:Baichuan Mo、Chunxia Chen、Jinsong Peng
DOI:10.1039/d3ra04454h
日期:——
2-a]pyrimidin-4-ones were synthesized via a one-pot tandem CuI-catalyzed C–N bond formation/intramolecular amidation reaction at 130 °C in DMF. This protocol features simple operation, broad substrate scope, good functional group tolerance and gram scale preparation, thus allowing practical and modular synthesis of pyrido[1,2-a]pyrimidin-4-ones from readily available 2-halopyridine and (Z)-3-amino-3-arylacrylate
通过一锅串联 CuI 催化 C-N 键形成/分子内酰胺化反应在 130 °C DMF 中合成各种多取代吡啶并[1,2- a ]嘧啶-4-酮。该方案具有操作简单、底物范围广、官能团耐受性好和克级制备的特点,从而可以从容易获得的2-卤代吡啶和( Z )-吡啶并[1,2- a ]嘧啶-4-酮进行实用和模块化合成。 3-氨基-3-芳基丙烯酸酯的产率良好至优异。
Diversity-Oriented Synthesis of Privileged Benzopyranyl Heterocycles from <i>s</i>-<i>cis</i>-Enones
作者:Heeseon An、Sung-Jin Eum、Minseob Koh、Sung Kwang Lee、Seung Bum Park
DOI:10.1021/jo702196f
日期:2008.3.1
[Graphics]A novel strategy for the construction of benzopyranyl heterocyclic series with maximized diversity in the polar surface area on rigid scaffolds has been developed through a divergent synthetic pathway with high efficiency. s-cis-Enones embedded in a benzopyran skeleton were identified as versatile key intermediates for the synthesis of four different heterocycle libraries fused with a benzopyran substructure. These four novel core skeletons were designed by a creative recombination of the privileged skeletons: benzopyran, pyridine, pyrazole, pyrazolopyrimidine, and pyrimidine. The regioselective synthesis of each core skeleton was achieved by the introduction of three s-cis enone intermediates. This paper also explores the regioselective formation of arylpyrazole through the condensation of beta-keto aldehyde with arylhydrazine under three different conditions and presents the mechanistic information that was obtained from the regioisomeric ratio of arylpyrazole based on the substituent's electronic effect and reaction temperature. It appears that the regioselective synthesis of arylpyrazole was achieved through the intriguing interplay of the nucleophilicity on arylhydrazine and the electrophilicity on dielectrophiles.