Inverse-electron-demanddiels-alder reactions of condensed pyridazines VI: Ring transformations of pyrido[2,3-d]pyridazine intog-fused quinolines
摘要:
A series of g-annelated quinolines was synthesized, employing pyrido[2,3-d]pyridazine as an azadiene in inverse-electron-demand Diels-Alder reactions with electron-rich dienophiles (enamines and a ketene-N,g-acetal). In cases where isomer mixtures were obtained, NOE difference spectroscopy was used for structural assignment.
Bidentate Lewis Acid-Catalyzed Inverse Electron-Demand Diels–Alder Reaction of Phthalazines and Cyclooctynes
作者:Hermann A. Wegner、Michel Große
DOI:10.1055/a-2204-9522
日期:——
Herein we report a method for facilitating the inverse-electron-demand Diels–Alderreaction of 1,2-diazines and cyclooctynes by utilizing a boron-based bidentate Lewis acid catalyst. Readily available electron-deficient and electron-rich phthalazines proved to be suitable substrates in this transformation. The described method enables the facile construction of diversely substituted polycyclic aromatic