A convergent construction of 1,4-dihydropyridine scaffold containing indole fragment
作者:Tao Chen、Xiao-Ping Xu、Hai-Feng Liu、Shun-Jun Ji
DOI:10.1016/j.tet.2011.05.065
日期:2011.7
Accompanying with the construction of 1,4-dihydropyridine scaffold, indol-3-yl-5-oxo-1,4,5,6,7,8-hexahydroquinoline, and indol-3-yl-1,4-dihydropyridine derivatives were facilely synthesized through three-component reactions of aromatic aldehydes, 3-cyanoacetyl indoles with 3-amino-2-enones in the presence of ammonium acetate. The 1,4-dihydropyridine core structure can be efficiently aromatized in the presence of stoichiometric 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). This chemistry provides an efficient and promising synthetic strategy to diversity-oriented construction of unaromatized and aromatized desired products. The advantages of the present protocol are atom-economy, simple work-up and easy purification of products by non-chromatographic methods. (C) 2011 Elsevier Ltd. All rights reserved.