A one-pot three-component synthesis of fused Spiro-Indoline/Indene derivatives derived from ethynyl azaindole by 1,3-dipolar cycloaddition reaction

A one-pot method for the simple, efficient, and environmentally benign protocol for the synthesis of Spiro-Indoline/Indene derivatives containing Aza indole moiety as a side chain is outlined. The 1,3-dipolar cycloaddition reaction of azomethine ylides derived from ethynyl Azaindole under mild conditions is accomplished. The low cost, easy availability of the starting material, and simple reaction conditions suggest the possible use of the present method for large-scale preparations.