Cu(II)-Promoted Transformations of α-Thienylcarbinols into Spirothienooxindoles: Regioselective Halogenation of Dienyl Sulfethers Containing Electron-Rich Aryl Rings
摘要:
Under the promotion of Cu(II) salts, the alpha-thienylcarbinols with an N-phenyl carbonyl group at the other alpha-position are converted into three different ranges of spirothienooxindoles involving dearomatizing Friedel-Crafts reaction. In addition, the unprecedented regioselective CuX2-mediated C-H functionalization/halogenation of dienyl sulfether containing electron-rich aryl rings is presented.
Cu(II)-Promoted Transformations of α-Thienylcarbinols into Spirothienooxindoles: Regioselective Halogenation of Dienyl Sulfethers Containing Electron-Rich Aryl Rings
摘要:
Under the promotion of Cu(II) salts, the alpha-thienylcarbinols with an N-phenyl carbonyl group at the other alpha-position are converted into three different ranges of spirothienooxindoles involving dearomatizing Friedel-Crafts reaction. In addition, the unprecedented regioselective CuX2-mediated C-H functionalization/halogenation of dienyl sulfether containing electron-rich aryl rings is presented.
spiro[thieno-oxindoles] were rearranged under acidic conditions into thieno[2,3-c]quinolin-4-ones, involving an interesting dienone–phenol-like mechanism. The transformation of 2-furylcarbinols into spiro[pentenone-oxindoles] seems to be the first stepwise C-Piancatelli rearrangement. The spirooxindole products were biologically evaluated, and some of them showed promising cytotoxic activities against DU145 and