Cu-Mediated Expeditious Annulation of Alkyl 3-Aminoacrylates with Aryldiazonium Salts: Access to Alkyl <i>N</i><sup>2</sup>-Aryl 1,2,3-Triazole-carboxylates for Druglike Molecular Synthesis
作者:Hao-Nan Liu、Hao-Qiang Cao、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acs.orglett.0c00006
日期:2020.2.21
Alkyl N-aryl 1,2,3-triazole-carboxylates are important molecules or intermediates in medicinal chemistry, but the synthesis of N2-aryl counterparts remains elusive. Herein, we describe a Cu-mediated annulation reaction of alkyl 3-aminoacrylates with aryldiazonium salts, both of which are readily available substrates. Furthermore, alkyl 2-aminoacrylates are also viable substrates. Diverse alkyl N2-aryl
2,3‐Dichloro‐5,6‐Dicyano‐1,4‐Benzoquinone (DDQ)‐Mediated Tandem Oxidative Coupling/Intramolecular Annulation/Dehydro‐Aromatization for the Synthesis of Polysubstituted and Fused Pyridines
作者:Dongping Cheng、Zhiteng Deng、Xianhang Yan、Mingliang Wang、Xiaoliang Xu、Jizhong Yan
DOI:10.1002/adsc.201900956
日期:2019.11.5
A DDQ‐mediated tandem reaction of 1,3‐diarylpropenes and β‐enaminoesters/4‐aminocoumarins is disclosed. It involves oxidative coupling, intramolecular annulation and dehydro‐aromatization reaction, which provides an efficient and mild method for the synthesis of polysubstituted and fused pyridines under metal‐free conditions.
Facile synthesis of pyrido[2,3-d]pyrimidines via cyclocondensation of 4,6-dichloro-2-methylsulfanylpyrimidine-5-carbaldehyde with β-substituted β-aminoacrylic esters
作者:Maria E. Chizhova、Olga Yu. Bakulina、Alexander Yu. Ivanov、Pavel S. Lobanov、Dmitrii V. Dar'in
DOI:10.1016/j.tet.2015.06.085
日期:2015.9
A new facile synthesis of pyrido[2,3-d]pyrimidin-4-ones via cyclocondensation of 4,6-dichloro-2-methylsulfanylpyrimidine-5-carbaldehyde with β-alkyl and β-aryl-β-aminoacrylic esters followed by hydrolysis of chlorine atom at position 4 of pyridopyrimidine ring has been developed. The cyclocondensation was found to be accelerated by acid.
通过4,6-二氯-2-甲基硫烷基嘧啶-5-甲醛与β-烷基和β-芳基-β-氨基丙烯酸酯的环缩合反应然后水解,可轻松合成吡啶并[2,3 - d ]嘧啶-4-酮已经开发了在嘧啶并嘧啶环的4位的氯原子。发现环缩合被酸加速。
Chiral Lewis Base-Catalyzed, Enantioselective Reduction of Unprotected β-Enamino Esters with Trichlorosilane
作者:Jianheng Ye、Chao Wang、Lin Chen、Xinjun Wu、Li Zhou、Jian Sun
DOI:10.1002/adsc.201501061
日期:2016.3.31
reduction of N‐unsubstituted β‐enamino esters represents a major challenge for asymmetric catalysis. In this paper, the first organocatalytic system that could be used for the asymmetric hydrosilylation of N‐unsubstituted β‐enamino esters has been developed. Using N‐tert‐butylsulfinyl‐L‐proline‐derived amides and L‐pipecolinic acid‐derived formamides as catalyst, a broad range of β‐aryl‐ and β‐alkyl‐substituted
Synthesis of Thiazoles and Isothiazoles via Three-Component Reaction of Enaminoesters, Sulfur, and Bromodifluoroacetamides/Esters
作者:Xingxing Ma、Xiaoxia Yu、Hua Huang、Yao Zhou、Qiuling Song
DOI:10.1021/acs.orglett.0c01275
日期:2020.7.17
three-component strategy for the synthesis of thiazoles and isothiazoles has been developed by employing enaminoesters, fluorodibromoiamides/ester, and sulfur. The thiazoles and isothiazoles were formed via two C–F bond cleavages along with the formation of new C–S, C–N, and N–S bonds. The strategy provides high selectivity for the synthesis of thiazoles/isothiazoles, which have vital applications in