Bis(sulfonamide) transmembrane carriers allow pH-gated inversion of ion selectivity
作者:Arundhati Roy、Oindrila Biswas、Pinaki Talukdar
DOI:10.1039/c7cc00165g
日期:——
Bis(sulfonamide) based syntheticcarriers are reported for inversion of ion selectivity upon deviation of pH within a narrow window. A liposomal membrane potential is also generated when potassium ions are passively transported by these carriers.
Effect of Sulfonyl Protecting Groups on the Neighboring Group Participation Ability of Sulfonamido Nitrogen
作者:Nicolas Proust、Judith C. Gallucci、Leo A. Paquette
DOI:10.1021/jo900065q
日期:2009.4.3
operates predominantly, electron-releasing groups also foster a ring-contraction process with ultimate 1,3-positioning of the pair of bromine atoms. The observed regio- and stereoselectivities, confirmed where necessary by X-ray crystallographic analysis, establish the capability of sulfonamide nitrogen centers to engage in neighboringgroupparticipation.
Bissulfonamide derivatives of formula (I) are capable of inhibiting: a) the biosynthesis of aromatic amino acids via the shikimate pathway and b) the catabolism of quinic acid, wherein: Ar is an aryl or heteroaryl group; R1 and R2 are the same or different and each represent hydrogen or alkyl or R1 and R2 together form a C1-C3 alkylene group, -CO- or -CS-; and R3 and R4 are the same or different and each represent -alkyl-aryl, -alkyl-heteroaryl, -alkenyl-aryl, -alkenyl-heteroaryl, -alkynyl-aryl-alkynyl-heterorayl, aryl or heteroaryl.
Aryl Bis-Sulfonamide Inhibitors of IspF from<i>Arabidopsis thaliana</i>and<i>Plasmodium falciparum</i>
4‐cyclodiphosphate synthase (IspF) is an essential enzyme for the biosynthesis of isoprenoid precursors in plants and many human pathogens. The protein is an attractive target for the development of anti‐infectives and herbicides. Using a photometric assay, a screen of 40 000 compounds on IspF from Arabidopsis thaliana afforded symmetrical aryl bis‐sulfonamides that inhibitIspF from A. thaliana (AtIspF)
2-甲基赤藓糖醇2,4-环二磷酸合酶(IspF)是植物和许多人类病原体中类异戊二烯前体生物合成的必需酶。该蛋白是开发抗感染剂和除草剂的有吸引力的靶标。使用光度测定法,对拟南芥IspF上的40 000种化合物进行筛选,得到对称的芳基双磺酰胺,可抑制拟南芥(At IspF)和恶性疟原虫(Pf IspF)的IspF,IC 50值在微摩尔范围内。在邻-二磺酰胺结构基元是用于抑制活性至关重要。通过平行合成获得的最佳衍生物显示IC 50的1.4μ值米针对Pf的ISPF和240Ñ米针对在ISPF。在2kg ha -1的剂量下观察到大量除草活性。分子模型研究是针对新型非对称磺酰胺IspF抑制剂的发现进行计算机搜索的基础。发现设计的化合物在两位数的微摩尔IC 50范围内表现出抑制活性。