Divergent Synthesis of F- and CF<sub>3</sub>-Containing N-Fused Heterocycles Enabled by Fragmentation Cycloaddition of β-CF<sub>3</sub>-1,3-Enynes with N-Aminopyridiniums Ylides
作者:Xiaotian Shi、Qiong Wang、Zhiqing Tang、Huilin Huang、Tongxin Cao、Hua Cao、Xiang Liu
DOI:10.1021/acs.orglett.4c00088
日期:2024.2.16
The two novel cyclization modes of β-CF3-1,3-enynes are presented herein for the divergent construction of F- and CF3-containing N-fused heterocycles. Fluorinated pyrazolo[1,5-a]pyridines were afforded from β-CF3-1,3-enynes with N-aminopyridiniums ylides via detrifluoromethylative [2 + 3] cyclizations, followed by fluorine transfer from a CF3 unit. Whereas reaction with N-aminoisoquinoliniums ylides
本文提出了β-CF 3 -1,3-烯炔的两种新环化模式,用于含F-和CF 3的N-稠合杂环的不同构建。氟化吡唑并[1,5- a ]吡啶由β-CF 3 -1,3-烯炔与N-氨基吡啶鎓叶立德通过脱三氟甲基化[2 + 3]环化得到,然后从CF 3单元进行氟转移。而与N-氨基异喹啉鎓叶立德的反应通过前所未有的断裂[3+2]-环加成得到CF 3 -取代的吡咯并[2,1- a ]异喹啉。此外,通过氟化杂环的进一步衍生化证明了克级实验和合成实用性。