Organocatalytic Asymmetric One-Pot Sequential Conjugate Addition/Dearomative Fluorination: Synthesis of Chiral Fluorinated Isoxazol-5(4<i>H</i>)-ones
作者:Wen-Ting Meng、Yan Zheng、Jing Nie、Heng-Ying Xiong、Jun-An Ma
DOI:10.1021/jo302419e
日期:2013.1.18
A facile one-pot sequential conjugate addition/dearomative fluorination transformation of isoxazol-5(4H)-ones with nitroolefins and N-fluorobenzenesulfonimide (NFSI) has been developed. By using a bifunctional chiral tertiary amino-thiourea catalyst, a series of chiral fluorinated isoxazol-5(4H)-ones containing one fluorine-substituted quarternary stereocenter were obtained in high yields with high
已经开发了一种方便的一锅连续的异恶唑-5(4 H)-酮与硝基烯烃和N-氟苯磺酰亚胺(NFSI)的顺序共轭加成/脱氟化法转化的方法。通过使用双功能手性叔氨基-硫脲催化剂,可以高收率获得具有高对映异构和非对映异构选择性的一系列含有一个氟取代的叔叔立体中心的手性氟化异恶唑-5(4 H)-。加合物的进一步转化可以得到具有三个连续立体中心的异恶唑烷-5-一衍生物。