Highly enantioselective [2 + 3] / [3 + 2] cycloadditions of allenoates and 1-azadiene catalyzed by N

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Chiral organophosphine catalysts play an outstanding role in enabling the highly selective creation of useful skeletons for natural product synthesis.In 1997, Zhang groups was first to report the highly enantioselective [3 + 2] cycloaddition reaction.[1] Afterwards, Fus groups reported highly enantioselective [4 + 2] annulations by using binaphthyl-based C2-symmetric phosphepines.[2] Recently, Lu, Zhao groups developed a series of simple amino acids-derived phosphine catalysts, which emerged highly enantioselective involving allenoates domino reaction.[3,4] In this reports, we reported a novel highly diastereoselective and enantioselective [2 + 3] / [3 + 2] cycloadditions between γ-substituent allenoates and 1-azadiene[5] catalyzed by N-acyl aminophosphines.
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