We have developed a catalytic protocol for Diels-Alder reaction using trialkylphosphonium oxoborates as oxyanion hole catalysts. The reaction can be operated under ambient conditions. Dienes could easily polymerize under acidic condition. Nonetheless, these acid-sensitive substrates are compatible with the catalytic protocol and the reaction scope covers a wide range of substrates.
Keywords: Diels-Alder Reaction; Non-Classical Hydrogen bond; Organocatalysis; Oxyanion hole; Phosphonium.
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