Synthesis of Furo[3,2-<i>b</i>]quinolines and Furo[2,3-<i>b</i>:4,5-<i>b′</i>]diquinolines through [4 + 2] Cycloaddition of Aza-<i>o</i>-Quinone Methides and Furans
作者:Lu Lei、Yi-Yun Yao、Li-Juan Jiang、Xiuqiang Lu、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.joc.9b02953
日期:2020.3.6
An approach for the construction of furo[3,2-b]quinolines and furo[2,3-b:4,5-b']diquinolines is developed through a metal-free [4 + 2] cycloaddition of easily available in situ generated aza-o-quinone methides and furans. The reaction tolerates a wide range of aza-o-quinone methides and substituted furans to afford the corresponding dihydro- or tetrahydrofuroquinolines in good to excellent yields.
A transition-metal-free method for the synthesis of indolines has been developed. In the presence of K2CO3, the cyclization reaction of N-(ortho-chloromethyl)arylamides and iodonium ylides proceeded smoothly at room temperature in moderate to good yields.
已经开发了用于合成二氢吲哚的无过渡金属的方法。在K 2 CO 3的存在下,N-(邻-氯甲基)芳基酰胺和碘鎓碘化物的环化反应在室温下以中等至良好的收率顺利进行。
A [4+3] Cycloaddition Reaction of Aza-ortho-quinone Methides with C,N-Cyclic Azomethine Imines for Synthesis of 1,2,4-Triazepines
The base-induced formal [4+3] cycloaddition reaction of C,N-cyclic azomethine imines with aza-ortho-quinone methides, generated in situ, is reported. This protocol provided an efficient method for the synthesis of biologically important 1,2,4-triazepine derivatives, with a wide substrate scope and excellent functional-group tolerance, and it gives moderate to excellent yields under mild conditions
(4 + 2) cyclization of aza-<i>o</i>-quinone methides with azlactones: construction of biologically important dihydroquinolinone frameworks
作者:Hai-Qing Wang、Wenjing Ma、Ao Sun、Xin-Yue Sun、Chao Jiang、Yu-Chen Zhang、Feng Shi
DOI:10.1039/d0ob02388d
日期:——
A base-promoted (4 + 2) cyclization of N-(o-chloromethyl)aryl amides with azlactones was established, which helped construct biologically important dihydroquinolinone frameworks in good yields.
Batting the ylides: A simple procedure carried out under mild conditions allows the direct and efficientsynthesis of structurally diverse indoles. This approach involves a cascadereaction of sulfurylides and N‐(ortho‐chloromethyl)arylamides (see scheme).