Unusual [4+2]-Cycloaddition Reaction between Electron-Poor1,2-Diaza-1,3-dienes and Electron-Poor Alkenes: Useful Entry to NovelTetrahydropyridazines

摘要

1,2-Diaza-1,3-dienes react with electron-poor alkenes togive the corresponding tetrahydropyridazines with high regio- andstereoselectivity. Both regio- and stereoselectivity can be explainedconsidering the interaction between the LUMO of the 1,2-diaza-1,3-diene and HOMO-1 of the alkene.