Synthesis and anti-inflammatory activity of acetylenic thiophenes
摘要:
A series of acetylenic thiophene derivatives have been synthesized via Pd-catalyzed coupling reaction of 2-(butyltelluro)thiophene with a variety of terminal alkynes. These compounds showed good anti-inflammatory activity in the carrageenin-induced paw edema assay on rats. (C) 2001 Elsevier Science Ltd. All rights reserved.
One-Pot Double-Annulation Strategy for the Synthesis of Unusual Fused Bis-Heterocycles
作者:Shukree Abdul-Rashed、Georgios Alachouzos、William W. Brennessel、Alison J. Frontier
DOI:10.1021/acs.orglett.0c01351
日期:2020.6.5
A novel metal-free double-annulation cascade for the construction of unusual fused heterocyclic systems is described. This simple protocol enables the sequential assembly of two rings in one pot from two simple precursors. Acidic conditions promote the condensation and the intramolecular alkynyl Prins reaction of an enyne or arenyne alcohol with a cyclic hemiaminal to form a five-, six-, or seven-membered
Palladium-catalysed atom-economical synthesis of conjugated dienals from terminal acetylenes and acrolein
作者:Zoë Hearne、Chao-Jun Li
DOI:10.1039/c7cc02767b
日期:——
the prevalence of the (E,E)-diene in a wide range of functional molecules. It is shown herein that (E,E)-dienals can be readily prepared in two palladium-catalysed steps from simple, unactivated starting materials; terminalacetylenes and acrolein can be coupled via conjugate addition, followed by alkyne isomerisation. This procedure provides a highly atom-economical, redox-neutral and practical method
Enantioselective Formal C(sp<sup>3</sup>
)−H Bond Activation in the Synthesis of Bioactive Spiropyrazolone Derivatives
作者:Houhua Li、Rajesh Gontla、Jana Flegel、Christian Merten、Slava Ziegler、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201811041
日期:2019.1.2
Herein, we report the first enantioselective annulation of α‐arylidene pyrazolones through a formalC(sp3)−Hactivation under mild conditions enabled by highly variable RhIII‐Cpx catalysts. The method has a wide substrate scope and proceeds with good to excellent yields and enantioselectivities. Its synthetic utility was demonstrated by the late‐stage functionalization of drugs and natural products
Sonogashira cross-coupling reactions with heteroaryl halides in the presence of a tetraphosphine–palladium catalyst
作者:Marie Feuerstein、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tetlet.2005.01.044
日期:2005.3
Heteroaryl halides undergoes cross-couplings with alkynes in good yields in the presence of [PdCl(C3H5)]2/cis,cis,cis-1,2,3,4-tetrakis(diphenylphosphinomethyl)cyclopentane as catalyst. A variety of heteroaryl halides such as pyridines, quinolines, a pyrimidine, an indole, a thiophene, or a thiazole have been used successfully. The reaction also tolerates several alkynes such as phenylacetylene and
在[PdCl(C 3 H 5)] 2 /顺式,顺式,顺式-1,2,3,4-四(二苯基膦甲基)环戊烷的存在下,杂芳基卤化物与炔烃进行交叉偶联,收率很高。已经成功地使用了各种杂芳基卤化物,例如吡啶,喹啉,嘧啶,吲哚,噻吩或噻唑。该反应还可以耐受几种炔烃,例如苯乙炔和一系列烷-1-炔醇。此外,该催化剂可在低负荷下与某些底物一起使用。
Facile synthesis of substituted thiophenes via Pd/C-mediated sonogashira coupling in water
作者:Sirisilla Raju、P. Rajender Kumar、K. Mukkanti、Pazhanimuthu Annamalai、Manojit Pal
DOI:10.1016/j.bmcl.2006.09.041
日期:2006.12
The first successful Pd/C-mediated Sonogashira coupling of iodothiophene with terminal alkynes in water is described here. Pd/C-CuI-PPh(3) was found to be an efficient catalyst system for this coupling reaction. Using this economic and reliable process a variety of acetylenic thiophenes with a wide range of functional groups were prepared in good yields. Synthetic applications and in vitro anticancer