2-硝基-1-(苯基磺酰基)吲哚(1)与丙二酸二乙酯和环己酮的烯醇化物,二甲基cup酸锂和吲哚阴离子进行亲核加成反应,得到相应的3-取代的-2-硝基吲哚(4-6、8, 9)从低到高的产量。1-(苯基磺酰基)-2-(三烷基锡烷基)吲哚13和14与四硝基甲烷的反应通过1,3-偶极环加成反应与原位生成的硝基甲腈氧化物(19)得到新型异恶唑并[5,4- b ]吲哚15)。
Synthesis of 2-nitroindoles via the Sundberg indole synthesis
作者:Erin T. Pelkey、Gordon W. Gribble
DOI:10.1016/s0040-4039(97)01272-0
日期:1997.8
A three-step sequence has been developed for converting o-nitrobenzaldehydes into 2-nitroindoles. The key step involves the thermolysis of 2-(o-azidophenyl)nitroethylene (10) in xylenes which gives 2-nitroindole (4) in 54% yield, akin to the classic Sundberg indole synthesis. This procedure has also been utilized to synthesize 5,6-dimethoxy-2-nitroindole (14).
A Sulfonylation Reaction: Direct Synthesis of 2-Sulfonylindoles from Sulfonyl Hydrazides and Indoles
作者:Pranjit Barman、Rajjakfur Rahaman
DOI:10.1055/s-0036-1588398
日期:——
novel TBHP/I2-mediated coupling of C3/unsubstituted indoles with sulfonyl hydrazides. The reaction utilizes readily available starting materials under mild reaction conditions, providing an alternative and attractive approach to 2-sulfonylindoles with high yields. The developed synthetic procedure is suitable for both N-protected or unprotected indoles.
通过 TBHP/I2 介导的 C3/未取代吲哚与磺酰肼的新型偶联,开发了 2-磺酰吲哚衍生物的无金属合成。该反应在温和的反应条件下使用容易获得的原料,为高产率的 2-磺酰吲哚提供了一种替代且有吸引力的方法。开发的合成程序适用于 N 保护或未保护的吲哚。
Electrooxidative Metal-Free Dehydrogenative α-Sulfonylation of 1<i>H</i>-Indole with Sodium Sulfinates
underwent this sulfonylation smoothly at room temperature under metal-free and chemical-oxidant-free conditions to afford indolyl arylsulfones in good to high yields. This reaction was found to tolerate a variety of functional groups, including halides and cyclopropyl, ether, ester, and aldehyde groups. It was applied to the synthesis of biologically active 5-HT6 modulators.
Iodine-Catalyzed Regioselective 2-Sulfonylation of Indoles with Sodium Sulfinates
作者:Fuhong Xiao、Hui Chen、Hao Xie、Shuqing Chen、Luo Yang、Guo-Jun Deng
DOI:10.1021/ol402987u
日期:2014.1.3
Iodine-catalyzed selective 2-arylsulfonyl indole formation from indoles and sodiumsulfinates is disclosed. Various substituted 2-arylsulfonyl indoles were obtained in one pot in the absence of metal catalyst at room temperature under air.
Convenient KI-catalyzed regioselective synthesis of 2-sulfonylindoles using water as solvent
作者:Hongjie Li、Xiaolong Wang、Jie Yan
DOI:10.1039/c7nj00474e
日期:——
A convenient procedure is developed for the preparation of 2-sulfonylindoles fromindoles and sodium sulfinates catalyzed by KI in water. This environmentally benign 2-sulfonylation of indoles proceeds efficiently under mild conditions, affording the products with high regioselectivity and in moderate to good yields.