New Synthetic Approach for the Preparation of Imidazole<i>N</i>
<sup>3</sup>-Oxide
作者:Hugo Cerecetto、Mercedes González、Alejandra Gerpe、Yolanda Fernández Sainz、Oscar E. Piro、Eduardo E. Castellano
DOI:10.1055/s-2004-831212
日期:——
A new synthetic procedure of 1-alkyl(aryl)-1H-4-methylimidazole N 3 -oxide derivatives by cyclocondensation of α-amine-oximes and orthoesters was studied. Low yields in the cyclization process were the result of predominant Z-stereoisomer around the oxime moiety of α-amineoxime reactants. Different attempts to improve these yields were assayed, mild conditions being those that produce the best results
研究了α-胺肟与原酸酯环缩合合成1-烷基(芳基)-1H-4-甲基咪唑N 3 -氧化物衍生物的新工艺。环化过程中的低产率是 α-胺肟反应物的肟部分周围主要的 Z-立体异构体的结果。分析了提高这些产量的不同尝试,温和条件是产生最佳结果的条件。此外,通过核磁共振光谱研究了咪唑N 3 -氧化物体系中H-2在溶液中的特殊酸性。该特性提供了一种方便的中间体来获得 2-取代的类似物。