One-pot syntheses of 3-cyanoindoles from 3-acyl- and 3-ethoxycarbonyl-1,2-dihydrocinnoline-1,2-dicarboximides
Abstract
2-Acyl- and 2-ethoxycarbonyl-3-cyanoindoles were prepared from 3-acyl- and 3-ethoxycarbonyl-1,2-dihydrocinnoline-1,2-dicarboximides and potassium cyanide via Michael addition, skeletal rearrangement and subsequent elimination of isocyanate.