Geometry-Constrained Iminopyridyl Palladium-Catalyzed Hydroarylation of Alkynes to Prepare Tri-substituted Alkenes Using Alcohol as Reductant
作者:Ke Wu、Nan Sun、Baoxiang Hu、Zhenlu Shen、Liqun Jin、Xinquan Hu
DOI:10.1002/adsc.201800423
日期:2018.8.17
straightforward method to prepare tri‐substituted alkenes through palladium‐catalyzed hydroarylation of alkynes with aryl bromides. Diarylacetylenes and alkyl(aryl)acetylenes could be well hydroarylated with various aryl bromides in moderate to excellent yields. Mechanistic studies suggested that alcohol was the reductant to provide hydride through β‐H elimination. Gram scale reaction further demonstrated
Radical Cyclization of Arenesulfonyl Chlorides and Alkynes: A Rapid Access to π-Conjugated Benzothiophenes
作者:Danyang Wan、Yudong Yang、Xingyan Liu、Mingliang Li、Siling Zhao、Jingsong You
DOI:10.1002/ejoc.201501439
日期:2016.1
A metal-free radicalcyclization of arenesulfonylchlorides with alkynes has been developed, which provides a rapid and practical access to a variety of π-conjugated benzothiophenes with a broad reactive functional group tolerance. Furthermore, dialkynyl compounds could also undergo this transformation to give extended π-systems in good yields.
Pd-Catalyzed decarboxylative alkynylation of alkynyl carboxylic acids with arylsulfonyl hydrazides<i>via</i>a desulfinative process
作者:Sheng Chang、Ying Liu、Shu Zhu Yin、Lin Lin Dong、Jian Feng Wang
DOI:10.1039/c8nj02964d
日期:——
In the presence of a Pd(II)/P-ligand catalytic system, decarboxylative alkynylation of alkynyl carboxylicacids and arylsulfonyl hydrazides by desulfinative coupling could provide aryl alkynes in satisfactory yields by either judiciously selecting palladium catalysts or modulating phosphine ligands under mild conditions. The reported coupling reactions are very practical as they do not require the
Cp<sub>2</sub>TiCl<sub>2</sub>-catalyzed hydrocarboxylation of alkynes with CO<sub>2</sub>: formation of α,β-unsaturated carboxylic acids
作者:Peng Shao、Sheng Wang、Gaixia Du、Chanjuan Xi
DOI:10.1039/c6ra25003c
日期:——
Cp2TiCl2-catalyzed hydrocarboxylation of alkynes with CO2 (atmospheric pressure) has been reported. A range of alkynes were transformed to the corresponding α,β-unsaturatedcarboxylicacids in high yields with high regioselectivity. The reaction proceeded with hydrotitanation, transmetalation, and subsequently carboxylation with CO2.
CsF-Mediated in Situ Desilylation of TMS-Alkynes for Sonogashira Reaction
作者:Joseph S. Capani、John E. Cochran、Jianglin (Colin) Liang
DOI:10.1021/acs.joc.9b01307
日期:2019.7.19
A practical and mild set of conditions for the Sonogashirareaction utilizing CsF-mediated in situ TMS-alkyne desilylation followed by Sonogashira coupling has been developed for the synthesis of a variety of alkynyl benzenes and heteroarenes in good to excellent yields. This methodology demonstrates excellent functional group tolerance and simple purification, which allows large-scale industrial applications