Transition-Metal-Free Method for the Synthesis of Benzo[b]thiophenes from o-Halovinylbenzenes and K2S via Direct SNAr-Type Reaction, Cyclization, and Dehydrogenation Process
摘要:
A new, highly efficient procedure for the synthesis of benzothiophenes from easily available o-halovinylbenzenes and potassium sulfide has been developed. The reaction tolerated a wide range of functionalities, and various 2-substituted benzo[b]thiophenes are provided in the high yields in the absence of a transition-metal catalyst.
Pd/Cu-free Heck and Sonogashira cross-coupling reaction by Co nanoparticles immobilized on magnetic chitosan as reusable catalyst
作者:Abdol R. Hajipour、Fatemeh Rezaei、Zahra Khorsandi
DOI:10.1039/c6gc03377f
日期:——
The chitosan (CS) is a porous self-standing nanofibrillar microspheres which can be used as a metal carrier. Amino-groups on CS enable to modulation of cobalt coordination using safe organic ligand...
Substituted CIS- and trans-stilbenes as therapeutic agents
申请人:Vander Jagt David L.
公开号:US20070249647A1
公开(公告)日:2007-10-25
The present invention relates to method(s) of treating a subject afflicted with cancer or a precancerous condition, an inflammatory disease or condition, and/or stroke or other ischemic disease or condition, the method comprising administering to the subject or patient in need a composition comprising a therapeutically effective amount of a substituted cis or trans-stilbene.
Pd/Cu‐free Heck and Sonogashira coupling reactions applying cobalt nanoparticles supported on multifunctional porous organic hybrid
作者:Abdol R. Hajipour、Zahra Khorsandi
DOI:10.1002/aoc.5398
日期:2020.4
cobalt catalyst has been synthesized by immobilizing Co species onto a nitrogen‐rich porous organic polymer (Co@imine‐POP). The heterogeneous catalyst synthesized was efficient in Heck and Sonogashira cross‐coupling reactions in green media under mild reactionconditions without inert air and phase transfer agents. This phosphine‐, copper‐, and palladium‐free catalyst was stable under the reaction conditions
A combination of zinc metal and a catalytic amount of chlorotrimethylsilane has been found to promote the transformation of various aldehydes and ketones with gem-dichloro compounds, such as benzylidene dichloride (1a) and methyl dichloroacetate (1b), to the corresponding cross-coupling products, such as substituted styrene 3 and methyl acrylates 4 derivatives, under mild reaction conditions in THF. The E-isomer of the corresponding alkenes was obtained stereoselectively in good-to-excellent yields. The reaction serves as a very convenient one-pot procedure.