Catalytic Asymmetric Cycloadditions between Aldehydes and Enolizable Anhydrides: <i>cis</i>-Selective Dihydroisocoumarin Formation
作者:Maria Luisa Aiello、Umar Farid、Cristina Trujillo、Brendan Twamley、Stephen J. Connon
DOI:10.1021/acs.joc.8b02332
日期:2018.12.21
In the presence of a trityl-substituted cinchona alkaloid-based catalyst, homophthalic, aryl succinic, and glutaconic anhydride derivatives reacted with aromatic and aliphatic aldehydes to produce cis-lactones in up to 90:10 dr and 99% ee. A DFT study has shown how the catalyst is uniquely able to bring about the opposite sense of diastereocontrol to that usually observed.
在三苯甲基取代的金鸡纳生物碱基催化剂的存在下,高邻苯二甲酸,芳基琥珀酸和戊二酸酐衍生物与芳族和脂族醛反应生成顺式内酯,其最高90:10 dr和99%ee。DFT研究表明,催化剂如何独特地带来与通常观察到的相反的非对映控制感。