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

[摘要]：1,2-Diaza- 1,3-dienes react with electron-poor alkenes to give the corresponding tetrahydropyridazines with high regio- and stereoselectivity. Both regio- and stereoselectivity can be explained considering the interaction between the LUMO of the 1,2-diaza-1,3-diene and HOMO-1 of the alkene.

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