Cu-Catalyzed Reaction of 1,2-Dihalobenzenes with 1,3-Cyclohexanediones for the Synthesis of 3,4-Dihydrodibenzo[<i>b,d</i>]furan-1(2<i>H</i>)-ones
作者:Nayyef Aljaar、Chandi C. Malakar、Jürgen Conrad、Sabine Strobel、Thomas Schleid、Uwe Beifuss
DOI:10.1021/jo3014275
日期:2012.9.21
The Cu(I)-catalyzed reaction of 1-bromo-2-iodobenzenes and other 1,2-dihalobenzenes with 1,3-cyclohexanediones in DMF at 130 °C using Cs2CO3 as a base and pivalic acid as an additive selectively delivers 3,4-dihydrodibenzo[b,d]furan-1(2H)-ones with yields ranging from 47 to 83%. The highly regioselective domino process is based on an intermolecular Ullmann-type C-arylation followed by an intramolecular
在130°C下,以Cs 2 CO 3为碱,新戊酸为添加剂,在DMF中Cu(I)催化1-溴-2-碘苯和其他1,2-二卤代苯与1,3-环己二酮的反应提供3,4-dihydrodibenzo [ b,d ]呋喃-1(2 H)-one,产率为47%至83%。高度区域选择性的多米诺过程是基于分子间的Ullmann型C-芳基化,然后是分子内的Ullmann型O-芳基化。通过使用取代的1-溴-2-碘苯和取代的1,3-环己二酮作为底物,可以得到取代的产物。与无环1,3-二酮反应生成相应的苯并[ b]呋喃。
Divergent synthesis of 3,4-dihydrodibenzo[<i>b</i>,<i>d</i>]furan-1(2<i>H</i>)-ones and isocoumarins <i>via</i> additive-controlled chemoselective C–C or C–N bond cleavage
Rh(III)-Catalyzed C–C/C–Obondformationbetween cyclic 2-diazo-1,3-diketones and salicylamides with additive-controlled chemoselectivity is described. The reaction proceeded under mild reaction conditions and exhibited good functional group tolerance and scalability. 3,4-Dihydrodibenzo[b,d]furan-1(2H)-ones were obtained in moderate to excellent yields (55–90%) through a tandem N–H activation/C–C cleavage/etherification