SEARCH Articles Figures Tables Diels-Alder reactions pyridine synthesis Furo pyridine via retro Diels-Alder reactions Pyridine, 2,3,4,5-tetrahydro-, Diels-Alder Pyridine, 2,3,4,5-tetrahydro-, Diels-Alder reactions with Pyridines Diels-Alder approach Pyridines via Diels-Alder reactions Pyridines via retro Diels-Alder reactions Pyridines, tetrahydrocarbene complexes via Diels-Alder reactions