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
Ru(II)-Catalyzed Decarbonylative Alkylation and Annulations of Benzaldehydes with Iodonium Ylides under Chelation Assistance
作者:Xiang Li、Yang Shen、Guodong Zhang、Xin Zheng、Qing Zhao、Zihe Song
DOI:10.1021/acs.orglett.2c01843
日期:2022.7.29
A Ru(II)-catalyzed decarbonylative alkylation and annulation of salicylaldehydes and 2-aminobenzaldehydes with iodonium ylides has been developed for the synthesis of dibenzo[b,d]furans and NH-free carbazolones. The reaction proceeds smoothly under mild conditions with a low catalyst loading and a broad substrate compatibility. Notably, hydroxy and free amino groups were demonstrated to be the effective
Ir(<scp>iii</scp>)-catalyzed decarbonylative annulation of salicylaldehydes with cyclohexane-1,3-diones
作者:Qiao-Juan Jiang、Yu-Tao Min、Yan-Ping Liu、Hua Li、Jun-Ao Peng、Cong-Jun Liu
DOI:10.1039/d2nj05242c
日期:——
decarbonylative annulation of salicylaldehydes with cyclohexane-1,3-diones has been achieved via the in situ generated iodonium ylides. The reaction proceeds smoothly under mild and operationally simple conditions, affording a variety of benzofuran derivatives in moderate to high yields with good functional group tolerance. Moreover, the large-scale synthesis and further modification of the products
通过原位生成的碘鎓叶立德,实现了 Ir( III ) 催化的水杨醛与环己烷-1,3-二酮的有效脱羰基环化反应。该反应在温和且操作简单的条件下顺利进行,以中等到高产率提供各种苯并呋喃衍生物,并具有良好的官能团耐受性。此外,产品的大规模合成和进一步修改突出了该协议的实用性。
Construction of Diverse Dihydrodibenzofuranones by Migration/Intramolecular Arylation of Iodonium Ylides
作者:Shizuka Mei Bautista Maezono、Hari Datta Khanal、Priyanka Chaudhary、Shreedhar Devkota、Yong Rok Lee
DOI:10.1002/bkcs.12209
日期:2021.2
A novel and facile methodology for synthesizing diverse dihydrodibenzofuranones from easily accessible cyclic iodonium ylides is achieved. This protocol proceeds through the aryl migration of iodonium ylide followed by Pd‐catalyzed intramolecular arylation.