2-Aminoquinazolines by Chan–Evans–Lam Coupling of Guanidines with (2-Formylphenyl)boronic Acids
作者:Aigars Jirgensons、Vitalii V. Solomin、Alberts Seins
DOI:10.1055/s-0040-1707080
日期:2020.9
A new method is presented for the synthesis of 2-aminoquinazolines, which is based on a Chan–Evans–Lam coupling of (2-formylphenyl)boronic acids with guanidines. Relatively mild conditions involving the use of inexpensive CuI as a catalyst and methanol as a solvent permit the application of the method to a wide range of substrates. Nonsubstituted, N-monosubstituted, and N,N-disubstituted guanidines
提出了一种合成 2-氨基喹唑啉的新方法,该方法基于(2-甲酰基苯基)硼酸与胍的 Chan-Evans-Lam 偶联。涉及使用廉价的 CuI 作为催化剂和甲醇作为溶剂的相对温和的条件允许该方法应用于广泛的基材。未取代的、N-单取代的和 N,N-二取代的胍可用作反应物,以从容易获得的(2-甲酰基苯基)硼酸以中等产率得到相应的 2-氨基喹唑啉。
Simple generalized reaction conditions for the conversion of primary aliphatic amines to surfactant-like guanidine salts with 1<i>H</i>-pyrazole carboxamidine hydrochloride
作者:T. A. Bakka、O. R. Gautun
DOI:10.1080/00397911.2016.1257724
日期:2017.1.17
ABSTRACT Improved reaction conditions for the electrophilic reaction between a free aliphaticamine and 1H-pyrazole carboxamidine have been discovered. The surfactant-like guanidine salts, which are often hard to work with, were obtained in decent yields with short reaction times, minimal workup, and high level of purity. GRAPHICAL ABSTRACT
A series of N-guanidino substituted 2,4-diamino-5-carbonylguanidine molecules related to amiloride were synthesised and, evaluated for their ability to inhibit the sodium-calcium exchanger in rat insulinoma cells (RINm5F) and human platelets. Specific chemical pathways were used to prepare the benzene derivatives designed as bioisosteric analogues of the pyrazine derivatives of amiloride. Several so-called 'simplified analogues', where some substituents of amiloride were omitted or replaced, were also prepared and included in the biological evaluation. The inhibitory potency of the sodium-calcium exchanger was screened on both cell types by measuring their effect on Ca-45(2+) uptake. Among the most active compounds, N-(2 -amino-5-chloro-4-nitrobenzoyl)-N'-(1-naphtylmethyl)guanidine (IC50 = 3.4 muM) was found more active than amiloride (IC50 = 690 muM) and 3,4-dichlorobenzamil (IC50 = 15.2 muM), the reference inhibitor. (C) 2001 Editions scientifiques et medicales Elsevier SAS.
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