Facile Microwave-Mediated Transformations of 2-Butene-1,4-diones and 2-Butyne-1,4-diones to Furan Derivatives
摘要:
Several di- and triarylfuran derivatives were prepared in high yields from but-2-ene-1,4-diones/but-2-yne-1,4-diones using formic acid in the presence of a catalytic amount of palladium on carbon and in poly(ethylene glycol)200 medium in a one-pot operation under microwave irradiation (1-5 min).
One-pot synthesis of pyrrole derivatives from (E)-1,4-diaryl-2-butene-1,4-diones
作者:H Surya Prakash Rao、S Jothilingam
DOI:10.1016/s0040-4039(01)01334-x
日期:2001.9
2,5-Di- and 1,2,5-trisubstituted pyrrolederivatives can be prepared conveniently from (E)-1,4-diaryl-2-butene-1,4-diones in a one-pot operation through domino-pathways via palladium-assisted transfer hydrogenation followed by a Paal–Knorr reaction using ammonium formate and its analogs.
作者:Deep Sankar Rudra、Sourav Chatterjee、Uttam Pal、Madhumita Mandal、Susri Ray Chaudhuri、Mrinmay Bhunia、Nakul Chandra Maiti、Shila Elizabeth Besra、Parasuraman Jaisankar、Snehasikta Swarnakar
DOI:10.1021/acs.jmedchem.3c00511
日期:2023.7.13
Indomethacin, a known nonsteroidal anti-inflammatory drug (NSAID) induces gastric inflammation, causing degradation of the extracellular matrix by specific matrix metalloproteinases (MMPs). We investigated the antiulcer efficacy of 3-indolyl furanoids (3g and 3c, i.e., methoxy substitution at 4- and 5-positions of the indole ring, respectively), derived from indomethacin. Interestingly, 3g protected
吲哚美辛是一种已知的非甾体类抗炎药 (NSAID),它会诱发胃部炎症,导致特定基质金属蛋白酶 (MMP) 降解细胞外基质。我们研究了源自吲哚美辛的 3-吲哚基呋喃类化合物(3g和3c,即分别在吲哚环的 4 位和 5 位上进行甲氧基取代)的抗溃疡功效。有趣的是,3g通过抑制 MMP-9 来预防体内吲哚美辛诱发的胃病。我们的工作制定了化学修饰策略,以开发更安全的非甾体抗炎药。此外,体外和计算机研究证实,3g通过与 MMP-9 的催化裂隙结合,抑制 MMP-9 活性,IC 50值为 50 μM,从而预防溃疡。药代动力学以大鼠血浆中的平均浓度-时间曲线表示,提取效率大于 70%,处理6.0 小时 ( t max ) 后的C max为 104.48 μg/mL ,半衰期和面积均在曲线分别为 7.0 h 和 1273.8 h μg/mL,表明3g的抗溃疡效力较高。
<b>The Base-catalyzed Addition of Methanol to Dibenzoylethylenes</b>
作者:Thomas I. Crowell、Grover C. Helsley、Robert E. Lutz、William L. Scott
DOI:10.1021/ja00887a016
日期:1963.2
Microwave mediated facile one-pot synthesis of polyarylpyrroles from but-2-ene- and but-2-yne-1,4-diones
作者:H.Surya Prakash Rao、S Jothilingam、Hans W Scheeren
DOI:10.1016/j.tet.2003.11.087
日期:2004.2
Several pyrrole derivates with multiple aryl substituents were prepared conveniently in a one pot-reaction from but-2-ene-1,4-diones and but-2-yne-1,4-diones via hydrogenation of the carbon-carbon double bond/triple bond followed by amination-cyclization. The reaction could be performed with ammonium formate or alkyl/arylammonium formates under Pd/C in polyethylene glycol-200 (PEG-200) under microwave irradiation. Using this procedure, different aryl-substituted pyrroles were prepared. Furthermore, studies on microwave vs thermal conditions indicate faster heating under microwave conditions was responsible for rate enhancement. (C) 2003 Elsevier Ltd. All rights reserved.
Domino Michael−Aldol Reactions on 1,4-Diarylbut-2-ene-1,4-diones with Methyl Acetoacetate Furnish Methyl 2-Aroyl-4- hydroxy-6-oxo-4-arylcyclohexane-1-carbox- ylate Derivatives
作者:H. Surya Prakash Rao、S. P. Senthilkumar
DOI:10.1021/jo0353839
日期:2004.4.1
Domino Michael-Aldol reactions on 1,4-diaryl-2-butene-1,4-diones with methyl acetoacetate in the presence of activated Ba(OH)(2) furnished methyl (1R*,2S*,4S*)-2-aroyl-4-hydroxy-6-oxo-4-arylcyclohexane-1-carboxylate derivatives in a stereo- and regiospecific manner. While treatment of these cyclohexanecarboxylate products with TsOH resulted in the dehydrated and decarbomethoxylated cyclohexenone derivatives, the reaction with NaOMe furnished 3,5-disubstituted phenols via dehydration, decarbomethoxylation, and dehydrogenation. NaCl/DMSO under microwave irradiation transformed the cyclohexanecarboxylate products to the 7-hydroxyisobenzofuranone derivatives.