Inverse Electron Demand Diels-Alder Reactions of Heterodienes Catalyzed by Potassium
Hydrogen Sulfate: Diastereoselective, One-Pot Synthesis of Pyranobenzopyrans, Furanobenzopyrans
and Tetrahydroquinolines Derivatives
R. Senthil Kumar, Rajagopal Nagarajan, Paramasivan T. Perumal* Organic Chemistry Division, Central Leather Research Institute, Adyar, Chennai - 600 020, India Fax: +91(44)24911589; e-Mail: ptperumal@hotmail.com;