Abstract: The intramolecular Diels-Alder cycloaddition of some N-acylimines has been shown to be a totally stereoselective process producing tetrahydropyridine systems having a trans relationship of hydrogens CY to nitrogen. Thus, thermolysis of 13 or 14 led to a 55: 45 mixture of trans-6, 5-fused cycloadducts 16 and 17, respectively. The stereostructures of these compounds were established by direct correlation with authentic methyl ...
