Synthesis of 4-Quinolones:<i>N</i>,<i>O</i>-Bis(trimethylsilyl)acetamide-Mediated Cyclization with Cleavage of Aromatic C-O Bond
作者:Ondřej Píša、Stanislav Rádl
DOI:10.1002/ejoc.201600178
日期:2016.5
4-dihydro-4-oxoquinoline derivatives (4-quinolones) based on a BSA [N,O-bis(trimethylsilyl)acetamide]-mediated cyclization of substituted 1-(2-methoxyphenyl)-3-(alkyl/arylamino)prop-2-en-1-ones is described. The reaction belongs to a rare set of cyclizations in which a methoxy group serves as the leaving group. Reaction takes place by the action of silylating agent under mild conditions and provides high yields of pure
基于 BSA [N,O-双(三甲基甲硅烷基)乙酰胺]介导的取代 1-(2-甲氧基苯基)-3-(烷基)环化合成 1,4-二氢-4-氧喹啉衍生物 (4-喹诺酮类) /芳基氨基)prop-2-en-1-ones进行了描述。该反应属于一组罕见的环化反应,其中甲氧基作为离去基团。反应在温和条件下通过甲硅烷基化剂的作用发生,并在简单的水处理后提供高产率的纯产品。该方法的多功能性以已制备的范围广泛的 1-烷基/芳基 3-羧酸酯和 3-腈为例。这种方法的一个关键优势是可以轻松获得起始甲氧基化合物,从而实现新的合成可能性并提高成本效率。