<i>tert</i>-Butyl Nitrite-Mediated Domino Synthesis of Isoxazolines and Isoxazoles from Terminal Aryl Alkenes and Alkynes
作者:Prasenjit Sau、Sourav Kumar Santra、Amitava Rakshit、Bhisma K. Patel
DOI:10.1021/acs.joc.7b00946
日期:2017.6.16
C═N, and C═O bonds from alkenes leading to the direct synthesis of isoxazolines in the presence of tert-butyl nitrite, quinoline, and the Sc(OTf)3 catalyst in DCE at 80 °C has been accomplished. An unprecedented three consecutive C–H functionalizations of two styrenes are involved in this isoxazoline synthesis. In this radical-mediated reaction, one-half of the aryl alkene is converted into an intermediate
烯烃中C–C,C–O,C═N和C═O键的顺序构建导致在亚硝酸叔丁酯,喹啉和Sc(OTf)3催化剂存在下直接合成异恶唑啉已经完成了在80°C下的DCE。这种异恶唑啉合成过程涉及两个苯乙烯前所未有的连续三个C–H官能化。在该自由基介导的反应中,一半的芳基烯烃被转化为中间体2-硝基酮,该中间体用作1,3-双极性亲和剂,并与未反应的芳族末端烯烃的另一半进行环加成。使用炔烃代替烯烃导致在相同反应条件下形成异恶唑。