Simple and efficient Knoevenagel synthesis of (E)-2-((1H-indol-3-yl)methylene)-3-oxoindolylnitrile catalysed by PPh3
作者:M VENKATANARAYANA、P K DUBEY
DOI:10.1007/s12039-011-0136-x
日期:2011.9
Triphenylphosphine (TPP) is found to be an efficient catalyst for the Knoevenagel condensation of indole-3-carboxyaldehydes 1(a–e) and their N-substituted derivatives 4(a–e) with the active methylene compound, i.e., 3-cyanoacetylindole (2), affording novel substituted olefins 3(a–e) and 5(a–e) respectively. The latter products reacted with DMS in the presence of PEG-600 to afford the corresponding N, Nl dimethylated derivatives 6(a–e).