The reaction of 3-formylchromones with aminoheterocycles was investigated. A simple and flexible general procedure for annulation of 5-(2-hydroxybenzoyl)pyridines was proposed. The best reaction conditions were found to be heating the reaction mixture in DMF in the presence of Me 3 SiCl as a promoter and water as scavenger.
研究了 3-甲酰基色酮与氨基杂环的反应。提出了一种简单灵活的 5-(2-羟基苯甲酰基) 吡啶环化的通用程序。发现最好的反应条件是在作为促进剂的 Me 3 SiCl 和作为清除剂的水存在下在 DMF 中加热反应混合物。
The enhanced π–π interactions in metallomesogens
作者:Ta-Ming Liu、Kuan-Ting Lin、Fu-Joun Li、Gene-Hsiang Lee、Ming-Chou Chen、Chung K. Lai
DOI:10.1016/j.tet.2015.09.006
日期:2015.11
Two new series of mesogenic palladium complexes 1a-b derived from salicylaldimines containing phenyl or naphenyl moiety were prepared, characterized and their mesomorphic properties investigated. Two single crystallographic structures of mesogenic 1a (n=4) and nonmesogenic 1b (n=3) were determined by X-ray analysis; both crystals crystallize in a triclinic space group P1. The geometry at both palladium atoms was nearly square planar. All Schiff bases 2a-b and palladium complexes lab exhibited mesomorphic properties. However, the formation of mesophases was sensitive to terminal naphthalyl and phenyl group. Compounds 2a formed N or/and SmC phases and compounds 2b exhibited N or/and SmC phases. In contrast, palladium complexes 1a formed N or N/SmC phases and complexes 1b exhibited N, N or/and SmC phases. Compounds 1b have a higher clearing temperature than those of 1a by a Delta T-cl=35.4-14.8 degrees C. An improved mesomorphic behavior observed in compounds 1b was attributed to the H-bonds and pi-pi interaction. (C) 2015 Elsevier Ltd. All rights reserved.
Studies on antiallergy agents. III. Synthesis of 2-anilino-1,6-dihydro-6-oxo-5-pyrimidinecarboxylic acids and related compounds.
A series of 2-anilino-1,6-dihydro-6-oxo-5-pyrimidinecarboxylic acids with various substituents was synthesized and evaluated in the rat passive cutaneous anaphylaxis test for antiallergic activity. High activity by intraperitoneal and oral administrations was observed for the 3-trifluoromethyl and 2-alkoxyanilino derivatives (64, 79, 81, 82 and 85). Structure-activity relationships are discussed.