SEARCH Articles Figures Tables Indoles Madelung synthesis Indoles from o-alkylanilides-the Madelung synthesis MADELUNG Indole synthesis Madelung indole synthesis applications Madelung indole synthesis modifications Madelung synthesis electrophiles Madelung synthesis of indole Madelung synthesis of indoles Madelung synthesis preparation Solid-Phase Madelung Indole Synthesis Wittig-Madelung indole synthesis