Mechanistic aspects of the oxidation of 1,3-disubstituted 6-amino-5-nitrosouracils with lead tetraacetate: the formation of pyrimido[5,4-g]pteridinetetrone 10-oxides
摘要:
Lead tetraacetate oxidation of 1,3-disubstituted 6-amino-5-nitrosouracils 1 in glacial acetic acid results in the formation of 1,3,6,8-tetrasubstituted pyrimido[5,4-g]pteridine-2,4,5,7(1H,3H,6H,8H)-tetrone 10-oxides 2. ESR studies and a number of chemical observations suggest a novel reaction sequence involving oxidative dimerization of 1 followed by intramolecular cyclization, oxidation, and homolytic elimination of nitrous oxide.
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
A New Series of Antibacterial Nitrosopyrimidines: Synthesis and Structure-Activity Relationship
作者:Monica Olivella、Antonio Marchal、Manuel Nogueras、Manuel Melguizo、Beatriz Lima、Alejandro Tapia、Gabriela E. Feresin、Oscar Parravicini、Fernando Giannini、Sebastián A. Andujar、Justo Cobo、Ricardo D. Enriz
DOI:10.1002/ardp.201400271
日期:2015.1
enteritidis. A detailed structure–activityrelationship study, supported by theoretical calculations, aided us to identify and understand the minimal structural requirements for the antibacterial action of the nitrosopyrimidines reported here. Thus, our results have led us to identify a topographical template that provides a guide for the design of newnitrosopyrimidines with antibacterial effects.
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.
The effect of push–pull interactions in a series of variously substituted 5-nitrosopyrimidines on the strength of intramolecularhydrogen bonds, the height of rotational barriers around formally single bonds, UV–vis spectra and electrochemical behavior is explored. Intramolecular charge transfer (ICT) leads to a shift of electron density from electron-donating substituents, which is readily observable
Method of nitrosation of an aromatic organic compound, involving continuous preparation of dinitrogen trioxide in a microreactor, and continuous reaction of dinitrogen trioxide with the aromatic organic compound.