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.
Sulphonamidic Groups as Electron‐Withdrawing Units in Ureido‐Based Anion Receptors: Enhanced Anion Complexation versus Deprotonation
conjugation to the sulphonamidic moiety showed higher association constants towards H2PO4− and carboxylate anions, while those containing electron‐withdrawing groups inclined to deprotonation of sulphonamidic NH . The deprotonation issue can be avoided by alkylation at the early step of receptor synthesis or it can be utilized for insertion of suitable groups that enable its anchoring on various substrates
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。