磺酰胺基团被用作吸电子基团,以增强基于尿素的受体的阴离子络合特征。合成并彻底测试了一系列磺酰胺基和尿素NH基团的酸度变化的受体。各个络合性质反映了给定分子中作为取代的函数的去质子/络合平衡。含有缀合sulphonamidic部分给电子基团的受体显示出朝向h时缔合常数2 PO 4 -和羧酸根阴离子,而那些含有吸电子基团倾向于sulphonamidic N中的去质子化ħ。可以通过在受体合成的早期阶段进行烷基化来避免去质子化问题,也可以将其用于插入合适的基团,从而使其锚定在各种底物上,从而形成更精细的受体结构。
磺酰胺基团被用作吸电子基团,以增强基于尿素的受体的阴离子络合特征。合成并彻底测试了一系列磺酰胺基和尿素NH基团的酸度变化的受体。各个络合性质反映了给定分子中作为取代的函数的去质子/络合平衡。含有缀合sulphonamidic部分给电子基团的受体显示出朝向h时缔合常数2 PO 4 -和羧酸根阴离子,而那些含有吸电子基团倾向于sulphonamidic N中的去质子化ħ。可以通过在受体合成的早期阶段进行烷基化来避免去质子化问题,也可以将其用于插入合适的基团,从而使其锚定在各种底物上,从而形成更精细的受体结构。
Highly specific N-monomethylation of primary aromatic amines
作者:Adolfo Le Pera、Antonella Leggio、Angelo Liguori
DOI:10.1016/j.tet.2006.03.104
日期:2006.6
A synthetic methodology for the specific conversion of primary aromatic amines into their N-monomethyl derivatives under very mild conditions is presented. Anilines are treated with 4-nitrobenzenesulfonyl (nosyl) chloride to generate the corresponding sulfonamides 2 in high yields. The subsequent N-methylation reaction of the sulfonamides 2 with a solution of diazomethane is rapid and quantitative
In order to create novel analgesic agents without gastric disturbance, structurally simple cyclooxygenase-1 (COX-1) inhibitors with a benzenesulfonanilide skeleton were designed and synthesized. As a result, compounds 11f and 15a, which possess a p-amino group on the benzenesulfonyl moiety and p-chloro group on the anilino moiety, showed COX-1-selective inhibition. Moreover compound 11f, which is the most potent compound in this study showed more potent analgesic activity than that of aspirin at 30 mg/kg by po. The anti-inflammatory activity and gastric damage, however, were very weak or not detectably different from aspirin. Since the structure of our COX-1 inhibitors are very simple, they may be useful as lead compounds for superior COX-1 inhibitors as analgesic agents without gastric disturbance. (c) 2006 Published by Elsevier Ltd.