The cascade cyclization reactions of 1,5-bisallenes grant access to a great variety of products by precisely tuning the catalyst system and/or the reagents involved. Herein, we present our findings that 1,5-bisallenes react with two molecules of dimethyl acetylenedicarboxylate to afford, in a completely diastereoselective manner, cis-3,4-arylvinyl pyrrolidines and cyclopentanes. DFT calculations have been used to postulate a mechanism for the developed reaction which encompasses a [2+2+2] cycloaddition reaction of the two alkynes and the external double bond of one allene, followed by a cycloisomerization involving the internal double bond of the second allene.

中文翻译：

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Rh(I)-催化的 1,5-双丙炔和炔烃的级联环化形成顺式 3,4-芳乙烯基吡咯烷和环戊烷

通过精确调整催化剂系统和/或所涉及的试剂，1,5-双丙二烯的级联环化反应可以获得多种产品。在此，我们展示了我们的发现，即 1,5-双丙二烯与两个分子的乙炔二羧酸二甲酯反应，以完全非对映选择性的方式提供顺式-3,4-芳基乙烯基吡咯烷和环戊烷。DFT 计算已被用于假设已开发反应的机制，该反应包括两个炔烃和一个丙二烯的外部双键的 [2+2+2] 环加成反应，然后是涉及第二个炔烃的内部双键的环异构化艾伦。