[EN] BENZOFURAN UREAS OR CARBAMATES AND HETEROAROMATIC ANALOGUES THEREOF FOR USE IN THERAPY [FR] BENZOFURANE-URÉES OU CARBAMATES ET ANALOGUES HÉTÉROAROMATIQUES DE CEUX-CI DESTINÉS À ÊTRE UTILISÉS EN THÉRAPIE
Tandem Ullmann–Goldberg Cross-Coupling/Cyclopalladation-Reductive Elimination Reactions and Related Sequences Leading to Polyfunctionalized Benzofurans, Indoles, and Phthalanes
作者:Faiyaz Khan、Mehvish Fatima、Moheb Shirzaei、Yen Vo、Madushani Amarasiri、Martin G. Banwell、Chenxi Ma、Jas S. Ward、Michael G. Gardiner
DOI:10.1021/acs.orglett.9b02235
日期:2019.8.16
Cu[I]- and Pd[0]-based catalysts, compounds such as 1 and 7 engage in tandem Ullmann–Goldberg cross-coupling and cyclopalladation-reductive elimination reactions to givebenzofurans such as 8. Related reactions involving hetero-Michael additions of o-halogenated phenols or anilines to propiolates and the Pd[0]-catalyzed cyclization of the resulting conjugates provide, in a one-pot process, alternately
3-Disubstituted benzofurans were synthesized from acrolein dimer and 1,3-dicarbonyl compounds by using N-bromosuccinimide as an oxidizing agent. The method was used to synthesize two commercial drug molecules, benzbromarone and amiodarone. The proposed mechanism of the reaction involves a N-bromosuccinimide (NBS)-assisted autotandem catalysis with Lewis acid catalyst. To proof the proposed mechanism
<i>De novo</i> synthesis of benzofurans <i>via</i> trifluoroacetic acid catalyzed cyclization/oxidative aromatization cascade reaction of 2-hydroxy-1,4-diones
作者:Qiang Sha、Haixuan Liu
DOI:10.1039/c9ob01422e
日期:——
for the de novo synthesis of benzofurans from 2-hydroxy-1,4-diones is described. Using trifluoroacetic acid (TFA) as the catalyst and N-bromobutanimide (NBS) as the oxidant, 2-hydroxy-1,4-diones underwent a cyclization/oxidative aromatization cascade reaction to afford a variety of benzofuran derivatives in moderate to good yields. This is a practically useful method for the synthesis of benzofuran derivatives
Cycloaddition of Arynes with Iodonium Ylides: a Mild and General Route for the Synthesis of Benzofuran Derivatives
作者:Xiao-Cheng Huang、Yi-Lin Liu、Yun Liang、Shao-Feng Pi、Feng Wang、Jin-Heng Li
DOI:10.1021/ol800051k
日期:2008.4.1
A mild and general cycloaddition of arynes with iodonium ylides protocol has been developed for the synthesis of benzofurans. In the presence of CsF, ortho-silyl aryltriflates were reacted with iodonium ylides smoothly at room temperature in moderate to good yields.
Gold(III)-Catalyzed Tandem Reaction of<i>O</i>-Arylhydroxylamines with 1,3-Dicarbonyl Compounds: Highly Selective Synthesis of 3-Carbonylated Benzofuran Derivatives
A highly regioselective protocol for the synthesis of 3-carbonylated benzofuran derivatives has been developed involving the gold(III)-catalyzed tandem condensation/rearrangement/cyclization reaction of O-arylhydroxylamines with 1,3-dicarbonyl compounds.