One-pot two-component tandem multiple transformations in the synthesis of N,4-diaryl-2,3-dihydropyrrolo[3,4-c]quinolin-1,3-diones and their 3-thioxo-analogues under neat conditions
作者:Sreenivas Avula、Satish Koppireddi、Jayaram Reddy Komsani、Jagadeesh Babu Nanubolu、Rambabu Yadla
DOI:10.1039/c3ra43489c
日期:——
An efficient and exclusive synthesis of a decent library of hitherto unknown N,4-diaryl-3-thioxo-2,3-dihydropyrrolo[3,4-c]quinolin-1-ones by a one-pot two-component cascade reaction protocol under solvent-free conditions is disclosed for the first time. This novel procedure involves easy to obtain isatin and N,3-diaryl-3-oxo-propanthioamide derivatives in a series of DMAP catalyzed in situ transformations
通过一锅双组分级联反应方案高效且独特地合成迄今为止未知的 N,4-diaryl-3-thioxo-2,3-dihydropyrrolo[3,4-c]quinolin-1-ones 库在无溶剂条件下首次公开。这种新颖的方法包括在一系列 DMAP 催化原位转化中容易获得靛红和 N,3-二芳基-3-氧代-丙硫酰胺衍生物,水是唯一的副产物。该协议避免使用昂贵的催化剂、有毒试剂、溶剂和困难的反应条件,并且通过简单地用乙醇洗涤粗反应物质以去除未使用的起始材料,无需柱色谱即可纯化形成的专有产物。这种经济、环保、实用的方法的普遍性是通过准备几个新的2、4-二芳基吡咯并[3,4-c]喹啉-1,3-二酮来自相应的乙烯酮-N,O-缩醛,产率极佳。提出了产物形成的合理反应机制。