Development of a Catalytic Electron Transfer System Mediated by Transition Metal Ate Complexes: Applicability and Tunability of Electron-Releasing Potential for Organic Transformations
We have developed a catalyticelectrontransfer (ET) system composed of a transition metal ate complex (Me3M(II)Li; M = Co(II), Mn(II), Fe(II)) and magnesium. This system (catalytic Me3M(II)Li/Mg) turned out to be effective for various ET reactions, such as the desulfonylation of N-phenylsulfonyl amides, and others (the chemoselective cleavage of O-allyl groups, the reduction of nitro groups, the partial
我们开发了一种催化电子转移 (ET) 系统,由过渡金属盐络合物 (Me3M(II)Li;M = Co(II)、Mn(II)、Fe(II)) 和镁组成。该系统(催化 Me3M(II)Li/Mg)被证明对各种 ET 反应有效,例如 N-苯基磺酰胺的脱磺酰化,以及其他(O-烯丙基的化学选择性裂解、硝基的还原、二酮的部分还原,以及二苯基碘盐的还原偶联)。该系统的 ET 能力可以通过改变 ate 配合物的配体来调整。实验和电化学证明了这种可调性:烷氧基连接和双阴离子型 ET 复合物分别显示减弱和增强的还原能力。ET 能力的改变通过电化学测量和化学反应进行评估。这些结果为设计各种定制的 ET 复合物提供了基础。
Mechanistic insight into thermal 1,3- and 1,5-sulfonyl migrations of N-arenesulfonylphenothiazines and N-arenesulfonylphenoxazines
作者:Jiandong Wang、Kwon-Il Son、Jiaxi Xu
DOI:10.1007/s00706-016-1661-6
日期:2016.9
AbstractThe substrate scope and mechanistic insight of the thermal-induced 1,3- and 1,5-sulfonyl migration reactions of various sulfonamides have been investigated. The results indicate that both N-arenesulfonylphenothiazines and N-arenesulfonylphenoxazines can undergo 1,3- and 1,5-sulfonyl migrations to afford the corresponding aryl sulfone derivatives in modest regioselectivities and yields under
Ten 1-benzenesulfonyl-1,2,3,4-tetrahydroquinoline (BSTHQ) were synthesized and characterized and their antiprotozoal activities were investigated. This small library was designed by combining two chemical moieties that are known to be biologically active by itself. The BS group seems to be favorable for the antiparasitic activity, since the derivatives presented lower IC50 value than the precursor heterocycle. Most compounds were moderately active against T cruzi, but 3 showed a promising IC50 value (9.76μM) with low cytotoxicity (L6). Also, 3, 6 and 9 showed interesting activity and reasonable selectivity against P. falciparum. These derivatives are considered as lead scaffolds and merit further exploration through structure optimization.
Cyclic amination onto aromatic ring of sulfonamides with (diacetoxyiodo)arenes: Effect of sulfonyl group
作者:Hideo Togo、Yoichiro Hoshina、Masataka Yokoyama
DOI:10.1016/0040-4039(96)01292-0
日期:1996.8
Sulfonamides of primary amine bearing an aromaticring at γ-position were treated with (diacetoxyiodo)arene and iodine under irradiation conditions with a tungsten lamp to give the corresponding 1,2,3,4-tetrahydroquinoline derivatives in moderate to good yields. The present reaction proceeded under mild and neutral conditions.