The syntheses of pyrrolocoumarin and pyrroloquinolone derivatives
have been achieved in excellent yields from the acetylenic amines
by gold-catalyzed cycloisomerization in the absence of any silver
salts or any other bases. The acetylenic amines were in turn obtained
by Sonogashira coupling of the corresponding coumarin and quinolone
derivatives.
coumarin - quinolone - Sonogashira coupling - gold catalysis - intramolecular cyclization - cycloisomerization