An asymmetric intermolecular [4 + 2] cycloaddition of 1,3-dienes with dialkyl acetylenedicarboxylates, which was catalyzed by a rhodium(i)-chiral phosphoramidite complex, was developed. This protocol provided a highly enantioselective access to prepare carbonyl substituted cyclohexa-1,4-dienes with up to 96% yield and >99% ee. Notably, a cycloaddition on the 10 g scale gave the product in 92% yield and with 99% ee, which showed great potential for the scale-up synthesis of carbonyl substituted cyclohexa-1,4-dienes. In addition, oxidative aromatizations and hydrolysis of the products were also investigated.

中文翻译：

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Rh（i）催化的1,3-二烯与对乙酰二羧酸二烷基酯的对映选择性和可扩展的[4 + 2]环加成反应。

开发了由铑（i）-手性亚磷酰胺络合物催化的1，3-二烯与乙炔二羧酸二烷基酯的不对称分子间[4 + 2]环加成反应。该方案为制备羰基取代的环己-1,4-二烯提供了很高的对映选择性，产率高达96％，ee大于99％。值得注意的是，在10 g规模上进行环加成反应可得到92％收率和99％ee的产物，这显示出大规模生产羰基取代的环己-1,4-二烯的潜力。另外，还研究了产物的氧化芳构化和水解。