An Improved Cu-Based Catalyst System for the Reactions of Alcohols with Aryl Halides
作者:Ryan A. Altman、Alexandr Shafir、Alice Choi、Phillip A. Lichtor、Stephen L. Buchwald
DOI:10.1021/jo702024p
日期:2008.1.1
The use of 3,4,7,8-tetramethyl-1,10-phenanthroline (Me4Phen) as a ligand improves the Cu-catalyzed cross-coupling reactions of aryl iodides and bromides with primary and secondary aliphatic, benzylic, allylic, and propargylic alcohols. Most importantly, by employing this catalyst system, the need to use an excessive quantity of the alcohol coupling partner is alleviated. The relatively mild conditions
使用 3,4,7,8-四甲基-1,10-菲咯啉 (Me 4 Phen) 作为配体改善了 Cu 催化的芳基碘化物和溴化物与伯、仲脂肪族、苄基、烯丙基、和炔丙醇。最重要的是,通过使用这种催化剂体系,可以减轻使用过量醇偶联剂的需要。相对温和的条件、较短的反应时间和适度低的催化剂负载量允许在亲电子和亲核偶联伙伴上容忍多种官能团。
Imidazole derivatives. XXVII. Synthesis and radioprotective activity of substituted phenacylthioimidazoline and 3-phenyl-5,6-dihydroimidazo[2,1-B]thiazole hydrochlorides
作者:M. A. Iradyan、R. A. Aroyan、A. P. Engoyan、G. Kh. Grigoryan、S. É. Nersesyan、A. G. Panosyan
DOI:10.1007/bf02219246
日期:1994.7
Previously, we described the synthesis of phenacylthioimidazolines and investigated the biological properties of the corresponding hydrochlorides. It was found that some hydorchlorides exhibited quite significant sympathicolytic and mutagenic activity. Due to the low solubility of substituted phenacylthioimidazoline hydrobromides in water and the fact that they can cyclize into imidazothiazoles it
Improvement of Pharmacological Properties of Irreversible Thyroid Receptor Coactivator Binding Inhibitors
作者:Jong Yeon Hwang、Leggy A. Arnold、Fangyi Zhu、Aaron Kosinski、Thomas J. Mangano、Vincent Setola、Bryan L. Roth、R. Kiplin Guy
DOI:10.1021/jm9002704
日期:2009.7.9
We have previously reported the discover), and preliminary structure activity relationships of a series of beta-aminoketones that disrupt the binding of coactivators to TR. However, the most active compounds had moderate inhibitory potency and relatively high cytotoxicity, resulting in narrow therapeutic index. Additionally, preliminary evaluation of in vivo toxicology revealed a significant dose related cardiotoxicity. Here we describe the improvement of pharmacological properties of thyroid hormone receptor coactivator binding inhibitors. A comprehensive Survey of the effects of substitutents in key areas of the molecule was carried out based on mechanistic insight from the earlier report. This study revealed that both electron withdrawing and hydrophobic substituents on the aromatic ring led to higher potency. On the other hand, moving from an alkyl to a sulfonyl alkyl side chain led to reduced cytotoxicity, Finally, utilization of airline moieties having low pK(a)'s resulted in lowered ion channel activity without any loss of pharmacological activity.