Efficient Synthesis of 4- and 5-Substituted 2-Aminopyrimidines by Coupling of β-Chlorovinyl Aldehydes and Guanidines
作者:Anna S. Komendantova、Alexander V. Komkov、Yulia A. Volkova、Igor V. Zavarzin
DOI:10.1002/ejoc.201700737
日期:2017.8.10
A general, practical and simple synthesis of functionalized 2-aminopyrimidines starting from β-chlorovinyl aldehydes and amidines is reported. In the presence of potassium carbonate, various ketones have been efficiently incorporated into the pyrimidine derivatives by two-step sequence involving the Vilsmeier-Haack reaction followed by the condensation with guanidines. The protocol is distinguished
Preparation of quinolines from α-methylene-ketones
作者:J. M. F. Gagan、Douglas Lloyd
DOI:10.1039/j39700002488
日期:——
A convenient procedure for the preparation of 2,3- and 1,2,3-substituted quinolinesfromα-methylene-ketones, viaβ-chlorovinyladehydes, is described. A mechanism for the cyclisation is proposed. The n.m.r. spectra of a number of quinolines and quinolinium salts are recorded.
Cyclization of β‐Chlorovinyl Thiohydrazones into Pyridazines: A Mechanistic Study
作者:Anna S. Komendantova、Artem N. Fakhrutdinov、Leonid G. Menchikov、Alexey Yu. Sukhorukov、Igor V. Zavarzin、Yulia A. Volkova
DOI:10.1002/ejoc.201801118
日期:2019.1.23
heterocyclizations of β‐chlorovinyl thiohydrazones derived from oxamic acid thiohydrazides and β‐chlorovinyl aldehydes were performed to elucidate the reaction mechanism of pyridazine formation. We showed that model β‐chlorovinyl thiohydrazone undergoes multiple isomerization reactions in solution induced by thione–thiol tautomerism and Z/E‐isomerization at the C=N bond. Mechanistic rationalization along
进行了广泛的实验和理论研究,以研究衍生自乙酰胺酸硫酰肼和β-氯乙烯基醛的β-氯乙烯基硫hydr的异构化和杂环化,从而阐明了哒嗪形成的反应机理。我们表明,模型β-氯乙烯基硫hydr在C = N键的硫酮-硫醇互变异构和Z / E-异构化诱导的溶液中经历了多种异构化反应。机理合理化和计算研究表明,哒嗪主要由Z-硫醇异构体生成6硫hydr衍生的2,3-二氮杂三烯中间体的π电环化。通过1 H NMR监测证明了由于形成酸而加速的环化的自催化特性。
Reactions of hydrazones derived from oxamic acid thiohydrazides
作者:Yulia A. Volkova、Elena I. Chernoburova、Albina S. Petrova、Alexander A. Shtil、Igor V. Zavarzin
DOI:10.1080/10426507.2016.1250759
日期:2017.2.1
ABSTRACT This brief review describe the recent advances in using oxamic acid thiohydrazides as precursors for the formation of hydrazones intermediates from natural and synthetic compounds bearing a carbonyl group. These intermediates undergo a variety of synthetically useful transformations, which include nucleophilic addition and 6π-electrocyclic reactions to generate new heterocycles.
Alkyl- or arylsubstituted β-chlorovinylaldehydes react with sodium sulphide to give substituted β-mercaptoacroleines 1 and symmetrical bis-β-formylvinyl)-sulphides 2. From reactions of compounds of type 1 and β-chlorovinylaldehydes with a CH3 or CH2 group in β-position result in unsymmetrical bis-(β-formylvinyl)-sulphides 3, which undergo, under conditions of the aldol reaction, alkaline-catalysed