Pericyclic Reaction of Ketenes with Cascade Reaction Products of Pyridine N-Oxides and Dipolarophiles. X-Ray Structures of the Adducts and Formation Mechanism
The structures of the adducts derived from the reactions of substituted ketenes with dihydropyridine derivatives have been clarified by single crystal X-ray analyses and the formation mechanism is discussed on the basis of the reaction-path calculations by semiempirical and density functional theory (DFT) molecular orbital methods.