Lithium hydroxide mediated synthesis of 3,4-disubstituted pyrroles
作者:Ratnesh Sharma、Kapil Kumar、Mangilal Chouhan、Vikas Grover、Vipin A. Nair
DOI:10.1039/c3ra42569j
日期:——
LiOH·H2O in ethanol was found to be an effective reagent for the synthesis of 3,4-disubstituted pyrrole derivatives by the van Leusen method. In situ formation of chalcones from aromatic aldehydes and enolisable ketones, and their subsequent reaction with tosylmethyl isocyanide resulted in the formation and precipitation of pyrrole derivatives from the reaction medium, in good yields. The solvation effect of the polar medium facilitates the reaction.
bifonazole and pyrrolnitrin, two compounds belonging to the class of antimycotic drugs. The synthesis of the title pyrroles has been performed starting from 1,3-diaryl-2-propen-1-ones, which were reacted with tosylmethyl isocyanide to give 3-aroyl-4-arylpyrroles. Reduction of the resulting compounds by lithiumaluminumhydride furnished the related alcohols, which were treated with 1,1'-carbonyldimidazole to