Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States.
Org Lett. 2020 Aug 7;22(15):6026-6030. doi: 10.1021/acs.orglett.0c02116. Epub 2020 Jul 15.
The synthesis of 1,2-dihydroquinolines by the hydrazine-catalyzed ring-closing carbonyl-olefin metathesis (RCCOM) of -prenylated 2-aminobenzaldehydes is reported. Substrates with a variety of substitution patterns are shown. With an acid-labile protecting group on the nitrogen atom, in situ deprotection and autoxidation furnish quinoline. In comparison with related oxygen-containing substrates, the cycloaddition step of the catalytic cycle is shown to be slower, but the cycloreversion is found to be more facile.
本文报道了通过肼催化的 -prenylated 2-氨基苯甲醛的闭环羰基-烯烃复分解反应(RCCOM)合成 1,2-二氢喹啉。展示了具有各种取代模式的底物。氮原子上带有酸不稳定保护基时,可进行原位脱保护和自动氧化生成喹啉。与相关含氧底物相比,催化循环的环加成步骤较慢,但发现环重排更容易。