Synthesis of Difluorinated Heterocyclics through Metal-Free [8+1] and [4+1] Cycloaddition of Difluorocarbene
作者:Yimin Jia、Yuan Yuan、Jinfeng Huang、Zhong-Xing Jiang、Zhigang Yang
DOI:10.1021/acs.orglett.1c00577
日期:2021.4.2
With Ph3P+CF2COO– or TMSCF2Br as the difluorocarbene sources, a facile metal-free cycloaddition between heteroconjugated alkenes and difluorocarbene was developed for the highly convergent synthesis of novel difluorinated heterocyclics, including gem-difluorinated azetidines and 2,3-dihydrobenzofurans. The cycloaddition features high reactivity and regioselectivity, as well as good tolerance of various
以Ph 3 P + CF 2 COO –或TMSCF 2 Br作为二氟卡宾的来源,开发了一种在杂化共轭烯烃与二氟卡宾之间的无金属环加成的方法,用于高收敛性合成新型二氟杂环,包括宝石-二氟氮杂环丁烷和2,3。 -二氢苯并呋喃。环加成具有高反应性和区域选择性,以及对氮杂七富烯和邻醌甲基化物上的各种给电子或吸电子取代基的良好耐受性。