Regioselective synthesis of thiophene fused sultam derivatives via iodocyclization approach and their application towards triazole linker
作者:Deepak Kumar Barange、Veerababurao Kavala、Chun-Wei Kuo、Cheng-Chuan Wang、R.R. Rajawinslin、Janreddy Donala、Ching-Fa Yao
DOI:10.1016/j.tet.2014.07.005
日期:2014.10
4-iodo-2,3-disubstituted-2H-thieno[3,2-e][1,2]thiazine-1,1-dioxide was coupled with a variety of boronic acids (Suzuki coupling) and activated alkenes (Heck coupling). The iodo group was utilized for Sonogashira coupling followed by efficient transformation to azido precursor, which was used for the synthesis of various thieno-sultam linked with triazole.
在本文所述的温和反应条件下,使用碘通过碘环化方法有效地选择性合成4-碘-2,3-二取代-2 H-噻吩并[3,2- e ] [1,2]噻嗪-1,1-二氧化物衍生物。 。这种偶合-碘环化策略可耐受多种官能团,例如烷基,环烷基,苯基等,可选择性地产生六元杂环。所得的4-碘-2,3-二取代-2 H-噻吩并[3,2- e] [1,2]噻嗪-1,1-二氧化物与各种硼酸(Suzuki偶联)和活化的烯烃(Heck偶联)偶联。碘基用于Sonogashira偶联,然后有效转化为叠氮基前体,该叠氮基前体用于合成与三唑连接的各种硫杂-阿磺酰胺。
Pd-catalysed intramolecular transformations of indolylbenzenesulfonamides: <i>ortho</i>-sulfonamido-bi(hetero)aryls <i>via</i> C2-arylation and polycyclic sultams <i>via</i> C3 arylation
作者:Rajnikanth Sunke、Shabbir Ahmed Khan、K. C. Kumara Swamy
DOI:10.1039/d2ob01610a
日期:——
Palladium-catalysed and base-dependent intra-molecular ipso-substitution and cyclisation strategies involving N-indolyl-substituted aryl-sulfonamides for the rapid construction of 2-aryl indole and indole-fused six-membered sultams are described. The Pd(OAc)2/Ph3P/Et3N combination delivers indolyl C2 arylated motifs via C(2)–N bond cleavage followed by C–C bond formation. In sharp contrast to this, the Pd(OAc)2/Ph3P/K2CO3