A series of substituted derivatives containing the 1,4-benzodioxine or pyrrole nucleus are described. All the newly synthesized compounds were examined for their in vitro and in vivo anti-inflammatory activity. Several derivatives, including (S)-2, 14 and 17, showed more anti-inflammatory activity in vivo in these assays (rat paw oedema induced by carrageenan) than the known classical anti-inflammatory agent ibuprofen, whereas other compounds like 1 were equipotent to ibuprofen. Compound 17 was the most outstanding derivative because of its remarkable in vivo anti-inflammatory activity. In this paper, we examine and discuss the structure-activity relationships and anti-inflammatory activities of these compounds. (c) 2007 Elsevier Ltd. All rights reserved.
New strategy for the synthesis of N-aryl pyrroles: Cu-catalyzed C–N cross-coupling reaction of trans-4-hydroxy-l-proline with aryl halides
作者:V. Prakash Reddy、A. Vijay Kumar、K. Rama Rao
DOI:10.1016/j.tetlet.2010.12.016
日期:2011.2
trans-4-Hydroxy-L-proline is used for the first time as an effective nucleophilic coupling partner with aryl halides mediated by copper iodide with Cs(2)CO(3) as the base and DMSO as the solvent. Utilizing this protocol cross-coupling of trans-4-hydroxy-L-proline with a wide variety of substituted aryl halides to produce N-aryl pyrroles in moderate to good yields. (C) 2010 Elsevier Ltd. All rights reserved.
An elegant protocol for the synthesis of N-substituted pyrroles through C–N cross coupling/aromatization process using CuFe2O4 nanoparticles as catalyst under ligand-free conditions
A simple and efficient, ligand-free C-N cross-coupling of aryl halides/benzyl bromides with trans-4-hydroxy-L-proline has been developed to produce aromatized N-substituted pyrroles, using a catalytic amount of magnetically separable and recyclable CuFe2O4 nanoparticles, in the presence of Cs2CO3 in DMSO at 100 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.