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E-mail: kimjn@chonnam.ac.krReceived December 6, 2011, Accepted December 19, 2011An efficient synthesis of poly-substituted furans, pyrroles, and thiophenes was carried out in a regiocontrolledmanner via a three-step process; (i) conjugate addition of methyl cyanoacetate derivatives to α,β-enones, (ii)CuI-mediated aerobic oxidation, and (iii) Paal-Knorr type synthesis of five-membered heterocycles. Key Words : Furans, Pyrroles, Thiophenes, CuI, Paal-Knorr synthesisIntroductionRecently, we reported an efficient synthesis of 2,5-diketo-esters via a conjugate addition of methyl cyanoacetate toα,β-unsaturated ketone and a following CuI-mediated aerobicoxidation.

bulletin of the korean chemical society

Facile Regiocontrolled Three-Step Synthesis of Poly-Substituted Furans, Pyrroles, and Thiophenes: Consecutive Michael Addition of Methyl Cyanoacetate to α,β-Enone, CuI-Mediated Aerobic Oxidation, and Acid-Catalyzed Paal-Knorr Synthesis