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。
An efficient and eco-friendly synthesis of 2-pyridones and functionalized azaxanthone frameworks via indium triflate catalyzed domino reaction
作者:N. Poomathi、P. T. Perumal、S. Ramakrishna
DOI:10.1039/c6gc03440c
日期:——
A green and efficient one-pot method has been developed for the synthesis of 2-pyridone and functionalized azaxanthone frameworks using indium triflate as an environmentally friendly, reusable catalyst. In this one-pot reaction, 3-formylchromones display a diverse pattern of reactivity upon reaction with different classes of alkenes. An indium triflate-promoted reaction with (Z)-N-methyl-1-(methyl
Reaction of<i>N,N</i>'-dimethyl-2-nitroethene-1, 1-diamine with α,ß-unsaturated acyl isothiocyanates: Preparation of 1,3-thiazin-4-one and 4-nitro-1,2-thiazol-5(2<i>H</i>)-imine derivatives
作者:María I. García Trimiño、Arturo Macías Hermán Vélez Cabrera Castro、Arístides Rosado Pérez、Dally Moya Argilagos、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.19980810321
日期:——
The reaction of N,N'-dimethyl-2-nitroethene-1,1-diamine (8) with α,ß-unsaturatedacylisothiocyanates 9 affords 3,3-diamino-2-nitroacrylthioamides 10 (Scheme 2) in moderate-to-good yields. Cyclization of 10 under acidic conditions gives 1,3-thiazin-4-onederivatives of type 11. Oxidative cyclization of 10 with diethyl azodicaboxylate leads to 4-nitro-1,2-thiazol-5(2H)-iminederivatives 12.
Acid-Mediated Synthesis of Chromeno[2,3-b]pyridine Derivatives via Condensation of 2-Amino-3-formylchromones and 1-(Methylthio)-2-nitroenamine Derivatives
A convenient and effective protocol has been proposed for the synthesis of chromeno[2,3-b]pyridine derivatives via the CF3SO3H-catalyzed annulation of substituted 2-amino-3-formylchromones and various 1-(methylthio)-2-nitroenamine derivatives. This method is time-efficient, convenient, high-yielding, and exhibits a good functional group compatibility.
已经提出了一种方便有效的方案,用于通过 CF 3 SO 3 H 催化取代的 2-氨基-3-甲酰基色酮和各种 1-(甲硫基)-2环化合成色烯[2,3- b ] 吡啶衍生物-硝基烯胺衍生物。该方法省时、方便、收率高、官能团相容性好。
Eine neue Synthese des 2,6-Diamino-4-hydroxy-3-nitropyridins. New synthesis of 2,6-Diamino-4-hydroxy-3-nitropyridine
作者:Hubert Mertens、Reinhard Troschütz
DOI:10.1002/ardp.19863191014
日期:——
Synthese a partir d'acide cyanoacetique et de diamino-1,1- ou bis-methylamino-1,1 nitro-2 ethylene
合成 a partir d'acide cyanoacetique et de diamino-1,1-ou bis-methylamino-1,1 nitro-2 乙烯
Synthesis of Trisubstituted Isoxazoles from Nitroenamines and Aromatic Aldehydes
作者:Chao Lei、Zhenhong Gao、Xusheng Shao、Xiaoyong Xu、Zhong Li
DOI:10.1002/cjoc.201700170
日期:2017.10
A novel approach for the synthesis of trisubstituted isoxazoles from nitroenamines and aromaticaldehydes is developed. L‐Proline/potassium carbonate system was employed to promote this process. The reaction underwent nucleophilic attack of nitroenamines to aromaticaldehydes, intramolecular denitration, tautomerization and elimination of H2O to furnish the target compounds.