Cycloaddition reactions of 3,4-bismethoxycarbonyl-2-aza-1,3-dienes. The first example of an intramolecular [4 + 2] cycloaddition of simple 2-azadienes

Abstract
Electron-poor 2-aza-1,3-dienes undergo intramolecular [4 + 2] cycloaddition to unactivated carbon–carbon double and triple bonds in high yields.

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