Synthesis of Chiral Pyrazolone and Spiropyrazolone Derivatives through Squaramide-Catalyzed Reaction of Pyrazolin-5-ones with <i>o</i>-Quinone Methides
作者:Ji Zhou、Wen-Jun Huang、Guo-Fang Jiang
DOI:10.1021/acs.orglett.8b00025
日期:2018.2.16
A bifunctional squaramide-catalyzed reaction of pyrazolin-5-ones with o-quinone methides in situ generated from 2-(1-tosylalkyl)phenols has been successfully developed, providing a facile access to chiral pyrazolones with high enantioselectivities. In addition, the chiral spiropyrazolones with adjacent tertiary and quaternary stereogenic centers can also be obtained through cascade chlorination/cyclization
已成功开发了吡唑啉-5-酮与由2-(1-甲苯磺酰基烷基)苯酚原位生成的邻醌甲基化物的双官能方酰胺催化的反应,可轻松获得具有高对映选择性的手性吡唑啉酮。此外,还可以通过手性吡唑啉酮的级联氯化/环化来获得具有相邻的叔和四级立体异构中心的手性螺吡唑并酮。