多种非甾体系统可以充当雌激素受体(ER)的配体,在某些情况下,它们对两种ER亚型之一ERα或ERβ表现出选择性。我们为雌激素受体准备了一系列基于杂环的(呋喃,噻吩和吡咯)配体,并评估了它们作为ER配体的行为。开发了醛烯酮共轭加成方法和烯醇烷基化方法以制备分别为三取代和四取代系统的前体的1,4-二酮系统。所有的二酮都容易转化为相应的呋喃,但是由取代程度更高的1,4-二酮形成噻吩和吡咯是有问题的。在研究的系统中,四取代的呋喃被证明是最有趣的。它们是ERα结合和效能选择剂,三酚3-烷基-2,4,5-三(4-羟苯基)呋喃(15a-d)通常显示出比双酚类似物(15f-一世)。ERα的结合选择性高达50-70倍,转录激活研究表明,该系列的几个成员是ERα选择性激动剂,具有最佳化合物[3-ethyl-2,4,5-tris(4 -羟基苯基)呋喃,15b]对ER alpha具有完全的转录活性,而对ER be
An intriguing, facile, and efficient oxidation and cyclization of alkynes catalyzed by Pd(OAc)2 in a fluorous biphasic system of N,N-dimethylacetamide (DMA) and perfluorodecalin directly with molecular oxygen is described, which opens an efficient access to tetrasubstituted furans. Under the optimized conditions, intermolecular reaction between diverse alkynes provides the corresponding mixture of regioisomers with appreciable selectivity. Intramolecular oxidation and cyclization of alkynes are also successfully demonstrated. The reaction proceeds efficiently under mild conditions with atmospheric oxygen as the sole oxidant.
Synthesis of Tetrasubstituted Furans via Sequential Pd(OAc)2/Zn(OTf)2-Catalyzed Oxidation and Cyclization of Aromatic Alkynes with Molecular Oxygen
作者:Huanfeng Jiang、Azhong Wang、Qiuxiang Xu
DOI:10.1055/s-0028-1088216
日期:2009.4
The development of a new method for the synthesis of tetrasubstituted furans using aromatic alkynes is reported. The strategy involves a tandem process of palladium-catalyzed oxidation and Zn(OTf)2-catalyzed cyclization in the presence of molecular oxygen.
Unexpected Base-Promoted Synthesis of Tetrasubstituted Furans via Palladium-Catalyzed Oxidation and Cyclization of Carbon-Carbon Triple Bond with Molecular Oxygen
A new approach to the synthesis of tetrasubstituted furans using aromatic alkynes catalyzed by PdCl2 in DMA (N,N-dimethylacetamide)-H2O with dioxygen as the sole oxidant is described, in which the oxygen atom of the furan was from water. The preliminary mechanistic understanding of this transformation was investigated.
A novel efficient tandem cyclization–methoxylation reaction has been developed to synthesize cyclopentadienyl alkyl ethers via palladium-catalyzed trimerization of diarylethynes and elimination of one dimethoxymethyl benzene molecule. The reaction mechanism was investigated by the Q-Tof APCI-HRMS technique, and the fluorescent properties of the obtained compounds were studied in the solid state and in solution.
Reaction control in heterogeneous catalysis using montmorillonite: switching between acid-catalysed and red-ox processes
作者:José Antonio Morales-Serna、Bernardo A. Frontana-Uribe、Rosario Olguín、Virginia Gómez-Vidales、Leticia Lomas-Romero、Erendira Garcia-Ríos、Ruben Gaviño、Jorge Cárdenas
DOI:10.1039/c6ra05293b
日期:——
The use of montmorillonite, modified with a super-acid (CF3SO3H) in the presence of hydroquinone as a radical scavenger and under a nitrogen atmosphere, induced the formation of tetrasubstituted furans as...