Stereoselective and Regioselective Assembly of Spirooxindole [2,1-<i>b</i>]furan Motifs through a Tandem Friedel-Crafts Alkylation/5-<i>exo</i>-<i>dig</i>-Cyclization
作者:Nandarapu Kumarswamyreddy、Venkitasamy Kesavan
DOI:10.1002/ejoc.201601030
日期:2016.11
3-Alkynyl-3-OBoc (Boc = tert-butoxycarbonyl) oxindole derivatives underwent a CuII-mediated stereo- and regioselective Friedel–Crafts alkylation/5-exo-dig-cyclization with 2-naphthols or cyclic 1,3-diketones. This gave spirooxindole [2,1-b]furan motifs in good to excellent yields under ambient conditions, and the process has a wide substrate scope.
3-炔基-3-OBoc(Boc = 叔丁氧基羰基)羟吲哚衍生物与 2-萘酚或环状 1,3-二酮进行 CuII 介导的立体和区域选择性 Friedel-Crafts 烷基化/5-exo-dig-环化。这使螺羟吲哚 [2,1-b] 呋喃基序在环境条件下具有良好到优异的产率,并且该过程具有广泛的底物范围。