The diels-alder reaction of isoprene with 2-oxoindolin-3-ylidene derivatives
作者:C.G. Richards、D.E. Thurston
DOI:10.1016/s0040-4020(01)88693-2
日期:1983.1
The Diels-Alderreaction of isoprene with eight 2-oxoindoline-3-ylidene derivatives is discussed and the structure and conformation of the adducts assigned by the use of 270 MHz PMR spectroscopy. Some transformations of the adducts are also described.
(E)-2-Oxoindolin-3-ylidene ketones can be easily isomerized to their (Z)-isomers by AlCl3 at room temperature in CH2Cl2. The behaviour of the unsaturated dicarbonyl framework in the (Z)-configuration as a bidentate ligand can be the key-step of the isomerization. The limits of a reaction that allows to prepare several yet-unknown products is discussed.
Highly efficient regioselective synthesis of pyrroles via a tandem enamine formation–Michael addition–cyclization sequence under catalyst- and solvent-free conditions
作者:Thavaraj Vivekanand、Perumal Vinoth、B. Agieshkumar、Natarajan Sampath、Arumugam Sudalai、J. Carlos Menéndez、Vellaisamy Sridharan
DOI:10.1039/c5gc00365b
日期:——
An efficient three-component, catalyst-, solvent-, and column chromatography-free procedure was developed for the synthesis of 3-(1H-pyrrol-3-yl)indolin-2-ones.
An Environmentally Benign Cascade Reaction of 1,1-Enediamines (EDAMs) for Site-Selective Synthesis of Highly Functionalized 2,10-Dihydro-1<i>H</i>-imidazo[1′,2′:1,6]pyrido[2,3-<i>b</i>]indoles and Pyrroles
作者:Cong-Hai Zhang、Rong Huang、Zhong-Wei Zhang、Jun Lin、Sheng-Jiao Yan
DOI:10.1021/acs.joc.1c00211
日期:2021.4.16
were synthesized by the facile reaction of the (E)-3-(2-oxo-2-phenylethylidene)indolin-2-one derivatives and 2-(nitromethylene)imidazolidine under basic conditions (Cs2CO3) in ethanol. In addition, a diverse array of EDAM substrates (2b–2k) were tested in this reaction to afford the expected target compounds 5. This protocol is suitable for the combinatorial and parallelsyntheses of natural-like products
从(E)-3-(2-氧代-2-苯基亚乙基)吲哚-2-酮衍生物1和1,1合成吡啶并[2,3- b ]吲哚(α-咔啉,3)的新协议乙二胺(EDAM)2a通过意外的级联反应在乙醇中开发出来。通过相同的反应,尽管将混合物搅拌更长的时间(约48小时),也获得了吡啶并[2,3- b ]吲哚衍生物4。其结果是,二种官能α咔啉的3和4是由(的容易反应合成ë)-3-(2-氧代-2-苯基亚乙基)吲哚啉-2-酮衍生物和2-(硝基亚甲基)咪唑烷在乙醇中的碱性条件下(Cs 2 CO 3)。此外,在该反应中测试了多种EDAM底物(2b – 2k),以提供预期的目标化合物5。该方案适用于天然产物的组合和平行合成,包括高度官能化的α-咔啉和吡咯,尤其是2-氧代吲哚-3-基吡咯。该方法具有几个优点,例如操作简单实用(仅需过滤和洗涤,无需柱色谱),收率极高(72-98%),并可以产生具有潜在生物学活性的多种目标化合物文库。
Pietra; Tacconi, Farmaco, Edizione Scientifica, 1958, vol. 13, p. 893,907