Rh(<scp>i</scp>)-Catalyzed enantioselective and scalable [4 + 2] cycloaddition of 1,3-dienes with dialkyl acetylenedicarboxylates
作者:Robert Li-Yuan Bao、Junjie Yin、Lei Shi、Limin Zheng
DOI:10.1039/d0ob00361a
日期:——
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
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。