Methods of preparing N3-substituted-4-pyrimidones are disclosed. The methods include combining a 4-pyrimidone and a non-aqueous base, followed by an alkylating agent, for a time sufficient for the pyrimidone and the alkylating agent to react. Methods of preparing an N3-substituted-6-(substituted amino)uracil are also disclosed. The methods include (a) combining an N3-substituted-2-alkoxy-6-amino-4-pyrimidone with an amine compound selected from the group consisting of an amine salt and the corresponding free amine, to form a reaction mixture; and (b) heating the reaction mixture to at least 80° C. for a time sufficient for the N3-substituted-2-alkoxy-6-amino-4-pyrimidone and the amine compound to react to form the final product.
The design, synthesis, in vitro evaluation, and conformational study of nitrosopyrimidine derivatives acting as antifungal agents are reported. Different compounds structurally related with 4,6-bis(alkyl or arylamino)-5-nitrosopyrimidines were evaluated. Some of these nitrosopyrimidines have displayed a significant antifungal activity against human pathogenic strains. In this paper, we report a new
Alkoxy-5-nitrosopyrimidines: Useful Building Block for the Generation of Biologically Active Compounds
作者:Antonio Marchal、Manuel Nogueras、Adolfo Sánchez、John N. Low、Lieve Naesens、Erik De Clercq、Manuel Melguizo
DOI:10.1002/ejoc.201000195
日期:——
Several alkoxy-5-nitrosopyrimidines were synthesised and high regioselective and sequential nucleophilic aromatic substitution of methoxy groups in 2-amino-4,6-dimethoxy-5-nitrosopyrimidine was observed. The approach was applied to the synthesis of valuable polyfunctionalised aminopyrimidines capable of mimicking fused heterobicyclic derivatives of biological interest. In addition, new compounds were
Novel Procedure for Selective C-Nitrosation of Aminopyrimidine Derivatives Under Neutral Conditions. Scope and Synthetic Applications
作者:Antonio Marchal、Manuel Melguizo、Manuel Nogueras、Adolfo Sánchez、John N. Low
DOI:10.1055/s-2002-19760
日期:——
A novel simple method, based on treatment with isoamyl nitrite (IAN) in DMSO without any added acid, to produce selective C(5)-nitrosation of aminopyrimidine derivatives is described. It proved to be suitable for a multigram scale and applicable to a larger range of pyrimidine derivatives, including amino-dialkoxypyrimidines, than the procedures previously known. Its scope is analyzed and some example on the usefulness of the newly prepared substances as intermediates in the synthesis of fused heterobicyclic derivatives of potential biological interest is presented.
Microwave-Assisted Synthesis of Diversely Substituted Quinoline-Based Dihydropyridopyrimidine and Dihydropyrazolopyridine Hybrids
作者:Daniel Insuasty、Rodrigo Abonia、Braulio Insuasty、Jairo Quiroga、Kenneth K. Laali、Manuel Nogueras、Justo Cobo
DOI:10.1021/acscombsci.7b00091
日期:2017.8.14
An efficient, catalyst-free, and one-pot three-component procedure for the synthesis of novel and nitrogen rich dihydropyrido[2,3-d]pyrimidines and dihydro-1H-pyrazolo[3,4-b]pyridines bearing a quinoline pharmacophore fragment is provided. Reactions proceeded in DMF under microwave irradiation of three-component mixtures of formyl-quinoline derivatives, primary heterocyclic amines and cyclic 1,3-diketones
一种高效,无催化剂的单锅三组分方法,用于合成新型和富氮的二氢吡啶并[2,3- d ]嘧啶和带有喹啉的二氢-1H-吡唑并[3,4- b ]吡啶提供了药效团片段。在微波辐射下,甲酰喹啉衍生物,伯杂环胺和环状1,3-二酮的三组分混合物在DMF中进行反应。有趣的是,当将常规的回流加热用于起始5-氨基-1-苯基吡唑时,获得了相应的芳香化吡唑并吡啶作为主要产物。单晶X射线分析清楚地证实了二氢和芳构化产物的结构。