Oxidation Strategy for the Synthesis of Regioisomeric Spiroisobenzofuranopyrroles: Facile Entries to Spiro[isobenzofuran-1,2′-pyrrole] and Spiro[isobenzofuran-1,3′-pyrrole] Derivatives
developed to synthesize two kinds of racemic spiroisobenzofuranopyrrole analogues as regioisomers. In the presence of sodiumperiodate, cis-indeno[1,2-b]pyrrol-4(1H)-ones were converted into spiro[isobenzofuran-1,2′-pyrrole] derivatives by a two-step process. In addition, oxidative reactions promoted by lead tetraacetate were demonstrated using cis-indeno[2,1-b]pyrrol-8(1H)-ones as substrates, affording
Isomerization of Ninhydrin-Heterocyclic Ketene Aminal Adducts: Kinetic versus Thermodynamic Control, Solvent Dependency and Mechanism
作者:Nanyang Chen、Minming Zou、Xue Tian、Fengjuan Zhu、Danping Jiang、Jiagao Cheng、Xusheng Shao、Zhong Li
DOI:10.1002/ejoc.201402677
日期:2014.10
Ninhydrin and heterocyclic ketene aminals (HKAs) are versatile building blocks in organic chemistry. Reactions of ninhydrin with HKAs initially produced the kinetic products indeno[1,2-b]pyrrol-4(1H)-one derivatives, which could further isomerize to thermodynamic counterparts indeno[2,1-b]pyrrol-8(1H)-ones. The isomerization showed a strong solvent dependency and occurred through a decomposition–reconstruction
A New Access to 2,3-Dihydro Imidazo [1,2-c] Pyrimidines
作者:Mustapha Rahmouni、Aïcha Derdour、Jean Pierre Bazureau、Jack Hamelin
DOI:10.1080/00397919608003636
日期:1996.2
Abstract A simple and efficient route to 2,3-dihydro imidazo [1,2-c] pyrimidines 3(a-e) by reaction under focused microwave irradiation of N-Acyl imidates 1 with imidazolidine ketene aminals 2 is described.
Reactions of Heterocyclic Ketene Aminals with 2-[3-Oxoisobenzofuran-1(3H)-ylidene]malononitrile: Synthesis of Novel Polyfunctionalized 1,4-Dihydropyridine-Fused 1,3-Diazaheterocycles
An efficient method has been developed for the synthesis of a novel kind of polyfunctionalized 1,4-dihydropyridine-fused 1,3-diazaheterocycles via the reactions of heterocyclic ketene aminals (HKAs) with 2-[3-oxoisobenzofuran-1(3H)-ylidene]malononitrile.
Substrate-Controlled Three-Component Synthesis of Diverse Fused Heterocycles
作者:Anatoly A. Peshkov、Diana Gapanenok、Aleksandra Puzyk、Niyaz Amire、Alexander S. Novikov、Sofia D. Martynova、Stanislav Kalinin、Dmitry Dar’in、Vsevolod A. Peshkov、Mikhail Krasavin
DOI:10.1021/acs.joc.3c00497
日期:2023.8.4
A chemoselective strategy toward a variety of fused heterocyclic scaffolds relying on a three-component condensation of heterocyclic ketene aminals (HKAs) or corresponding thioaminals with aryl glyoxals and cyclic 1,3-dicarbonyl compounds has been developed and explored. Depending on the applied combination of substrates, the strategy can be tuned to provide straightforward access to imidazo[1,2-a]quinoline
已经开发和探索了一种针对各种稠合杂环支架的化学选择性策略,该策略依赖于杂环烯酮缩醛胺(HKA)或相应的硫代缩醛胺与芳基乙二醛和环状1,3-二羰基化合物的三组分缩合。根据所应用的底物组合,可以调整策略以直接获取咪唑并[1,2- a ]喹啉、吡咯并[1,2- a ]咪唑和吡咯并[2,1- b ]噻唑骨架。