Regioselective Synthesis of β-Aryl Enaminones and 1,4,5- Trisubstituted 1,2,3-Triazoles from Chalcones and Benzyl Azides
作者:Yu-Yang Xie、Ying-Chun Wang、Hong-En Qu、Xian-Chun Tan、Heng-Shan Wang、Ying-Ming Pan
DOI:10.1002/adsc.201400315
日期:2014.11.3
AbstractA highly regioselective synthesis of β‐aryl enaminones and 1,4,5‐trisubstituted 1,2,3‐triazoles from chalcones and benzyl azides based on reaction solvent selection is reported. In the presence of a catalytic amount of Ce(OTf)3, reactions of chalcones with benzyl azides in DMF at 100 °C afforded densely substituted Z‐β‐aryl enaminones in good to excellent yields, whereas treatment of chalcones with benzyl azides in toluene at 100 °C selectively produced 1,4,5‐trisubstituted 1,2,3‐triazoles in excellent yields.magnified image
A strategy to access fused triazoloquinoline and related nucleoside analogues
作者:Kapil Upadhyaya、Arya Ajay、Rohit Mahar、Renu Pandey、Brijesh Kumar、Sanjeev K. Shukla、Rama Pati Tripathi
DOI:10.1016/j.tet.2013.07.088
日期:2013.10
Fused triazoloquinolines have been prepared starting from (E)-3-(2-nitrophenyl)-1-aryl-prop-2-en-1-ones and sugar or benzyl azides in a sequential [3+2] cycloaddition reaction, followed by one pot Pd-C assisted reduction, cyclization and aromatization. The triazolyl fused quinolines with N-1-glycosyl substituents as unnatural nucleosides have inherent potential to generate a library of compounds for bioevaluations. (C) 2013 Elsevier Ltd. All rights reserved.