An efficient strategy for the general synthesis of 3-aryl substituted pyrazolo[5,1-c][1,4]benzoxazines and pyrazolo[1,5-a][1,4]benzodiazepin-6(4H)-ones
作者:Kaushik Brahma、Anup Kumar Sasmal、Chinmay Chowdhury
DOI:10.1039/c1ob06353g
日期:——
An efficient strategy for the general synthesis of 3-aryl substituted pyrazolo[5,1-c][1,4]benzoxazines and pyrazolo[1,5-a][1,4]benzodiazepin-6(4H)-ones has been developed using intramolecular 1,3-dipolar cycloaddition. The hydrazonoyl chloride, the precursor of the cycloadduct, is accessed easily through a two-step reaction carried out in one-pot. It is then used without purification for the base induced
一般合成3-芳基取代的吡唑并[5,1- c ] [1,4]苯并恶嗪和吡唑并[1,5- a ] [1,4]苯并二氮杂-6(4 H)-的有效策略是用分子内的1,3-偶极环加成反应开发了R.N.。通过一锅法进行的两步反应,可以轻松获得环加合物的前体酰肼基氯。然后将其未经纯化用于碱基诱导的亚硝胺的形成,其随后进行原位用炔烃进行分子内环加成反应,得到所需产物。该反应方案也已应用于双异环和生物感兴趣的尿嘧啶衍生物的合成中。该方法的操作简单,使用廉价的起始原料以及所需的相对较短的反应时间使该方法方便实用。