Chiral Squaramide Catalyzed Enantioselective 1,6-Michael Addition of Pyrazolin-5-ones to Styrylisoxazole Derivatives
作者:Vivek Sharma、Jasneet Kaur、Swapandeep S. Chimni
DOI:10.1002/ejoc.201800589
日期:2018.7.13
The cinchonidine squaramide catalyzed enantioselective 1,6‐Michael addition reaction of 3‐methyl‐4‐nitro‐5‐alkenylisoxazoles and pyrazolin‐5‐ones has been developed. Under mild reaction conditions, heterocyclic products that contain both pyrazole and isoxazole moieties were produced in up to 91 % yield with enantiomeric ratios (er) up to 91:9.
已开发出新奇可尼定方酸酰胺催化的3-甲基-4-硝基-5-烯基异恶唑和吡唑啉-5酮的对映选择性1,6-Michael加成反应。在温和的反应条件下,同时含有吡唑和异恶唑部分的杂环产物的产率高达91%,对映体比率(er)高达91:9。