A mild, easy-to-perform, and versatile method for the formation of aminochlorodiazines from reaction of several types of dichlorodiazines (i.e., pyridazines, pyrimidines, and pyrazines) with primary or secondary amines in ethanol in the presence of triethylamine as a base, is described. The methodology is general and efficient despite noticeable difference in reactivity between diazines. While dichloropyridazine and dichloropyrazine require several hours of heating at reflux for the reaction to proceed, dichloropyrimidines reach completion within minutes at room temperature. (C) 2015 Elsevier Ltd. All rights reserved.
A pyrimidine derivative of formula (I) or (I'): wherein: Rx is a substituent as defined within; Q¿1? is optionally substituted phenyl, and Q1 bears a substituent of formula (Ia) wherein: X, Y?1, Y2¿, Z, n, and m are as defined within; -NQ¿2? is an optionally substituted heterocyclic moiety containing one nitrogen heteroatom and optionally containing a further heteroatom; or a pharmaceutically acceptable salt in vivo hydrolysable ester thereof; are useful as anti-cancer agents. Processes for their manufacture and pharmaceutical compositions containing them are described.
Selective mono-amination of dichlorodiazines
作者:Stéphane Sengmany、Julie Lebre、Erwan Le Gall、Eric Léonel
DOI:10.1016/j.tet.2015.05.056
日期:2015.7
A mild, easy-to-perform, and versatile method for the formation of aminochlorodiazines from reaction of several types of dichlorodiazines (i.e., pyridazines, pyrimidines, and pyrazines) with primary or secondary amines in ethanol in the presence of triethylamine as a base, is described. The methodology is general and efficient despite noticeable difference in reactivity between diazines. While dichloropyridazine and dichloropyrazine require several hours of heating at reflux for the reaction to proceed, dichloropyrimidines reach completion within minutes at room temperature. (C) 2015 Elsevier Ltd. All rights reserved.
An Electrochemical Synthesis of Functionalized Arylpyrimidines from 4-Amino-6-Chloropyrimidines and Aryl Halides
作者:Stéphane Sengmany、Erwan Le Gall、Eric Léonel
DOI:10.3390/molecules16075550
日期:——
A range of novel 4-amino-6-arylpyrimidines has been prepared under mild conditions by an electrochemical reductive cross-coupling between 4-amino-6-chloro-pyrimidines and functionalized aryl halides. The process, which employs a sacrificial iron anode in conjunction with a nickel(II) catalyst, allows the formation of coupling products in moderate to high yields.