A Convenient Modification of the Fischer Indole Synthesis with a Solid Acid
作者:Sosale Chandrasekhar、Somnath Mukherjee
DOI:10.1080/00397911.2014.984854
日期:2015.4.18
the cation exchange resin Amberlite IR 120 in refluxing ethanol. A variety of enolizable aldehydes, and ketones and several substituted phenylhydrazines could thus be converted to the corresponding indoles in excellent yields (70–88%). Reaction times were typically 6–10 h, with the resin being then filtered off and the product isolated after minimal workup. GRAPHICAL ABSTRACT
摘要 标题反应的新一锅版本包括在回流乙醇中加热羰基化合物、苯肼和阳离子交换树脂 Amberlite IR 120 的混合物。因此,各种可烯醇化的醛、酮和几种取代的苯肼可以以极好的收率(70-88%)转化为相应的吲哚。反应时间通常为 6-10 小时,然后将树脂过滤掉,并在最少的后处理后分离产物。图形概要
Iron‐Catalyzed Radical Activation Mechanism for Denitrogenative Rearrangement Over C(sp
<sup>3</sup>
)–H Amination
An iron‐catalyzed denitrogenative rearrangement of 1,2,3,4‐tetrazole is developed over the competitive C(sp3)–H amination. This catalytic rearrangement reaction follows an unprecedented metalloradical activation mechanism. Employing the developed method, a wide number of complex‐N‐heterocyclic product classes have been accessed. The synthetic utility of this radical activation method is showcased with
作者:Stuart R. Flanagan、David C. Harrowven、Mark Bradley
DOI:10.1016/s0040-4039(03)00094-7
日期:2003.2
Several radicalcyclisation reactions involving indoles are described. Most notably, we have shown that radical additions to C3 of an indole are frequently facile. A dichotomy in the course of radicalcyclisation reactions to C2 of the indole has also been exposed wherein 6-endo-trig cyclisations are propagated by the loss of a hydrogen atom from C2 while 5-exo-trig cyclisations are propagated by hydrogen
Rhodium-Catalyzed Synthesis of 2,3-Disubstituted Indoles from β,β-Disubstituted Stryryl Azides
作者:Ke Sun、Sheng Liu、Patryk M. Bec、Tom G. Driver
DOI:10.1002/anie.201006917
日期:2011.2.11
Rings à la carte: Rhodium carboxylate complexes catalyze selective cascade reactions to produce a range 2,3‐disubstituted indolesfromβ,β‐disubstituted stryrylazides. The selective migration of aryl groups appears to originate from a putative phenonium ion reactive intermediate (see scheme).