Asymmetric Synthesis of 3,4‐Dihydroquinolin‐2‐ones via Organocatalytic [4+2]‐Cyclization of 2‐Amino‐β‐nitrostyrenes with Azlactones
作者:Heebum Kim、Yeongju Kim、Sung‐Gon Kim
DOI:10.1002/adsc.202400061
日期:2024.4.23
been developed to synthesize enantioenriched 3,4‐dihydroquinoline‐2‐one derivatives. This innovative approach utilizes an asymmetric [4+2]‐cyclization process, combining 2‐amino‐β‐nitrostyrenes with azlactones, and is facilitated by a bifunctional squaramide‐based organocatalyst. This innovative approach has enabled the creation of novel chiral 3,4‐dihydroquinoline‐2‐ones with complex structures, including
二氢喹啉-2-酮因其显着的生物活性而被认可,具有独特的六元结构和含氮杂环。开发了一种突破性方法来合成对映体富集的 3,4-二氢喹啉-2-酮衍生物。这种创新方法利用不对称[4+2]环化过程,将2-氨基-β-硝基苯乙烯与吖内酯结合,并通过双功能方酰胺基有机催化剂促进。这种创新方法使得能够创建具有复杂结构(包括手性四级中心)的新型手性 3,4-二氢喹啉-2-酮。该工艺非常高效,可实现高产率(高达 91%)、出色的对映体过量(高达 97% ee)和卓越的非对映选择性(高达 19:1 dr)。