Diastereoselective, multicomponent access to trans-2-aryl-4-arylamino-1,2,3,4-tetrahydroquinolines via an AA′BC sequential four-component reaction and their application to 2-arylquinoline synthesis
作者:Pascual Ribelles、Vellaisamy Sridharan、Mercedes Villacampa、Mª Teresa Ramos、J. Carlos Menéndez
DOI:10.1039/c2ob26754c
日期:——
The CAN-catalyzed reaction between 3,5-disubstituted anilines, vinyl ethers and aromatic aldehydes leads to trans-2-aryl-4-arylaminotetrahydroquinolines, in an AAâ²BC sequential multicomponent transformation related to the Povarov reaction that was also extended to the use of a second aniline as the C-4 substituent. The unusual trans stereochemistry was explained by stabilization of the corresponding intermediate by intramolecular hydrogen bonding. The presence of the 4-anilino substituent allowed adapting the method to the synthesis of 4-unsubstituted 2-arylquinolines, by treatment of the crude product from the MCR with FeCl3 in methanol.
3,5-二取代苯胺、乙烯基醚和芳香醛之间的 CAN 催化反应生成反式-2-芳基-4-芳基氨基四氢喹啉,在与 Povarov 反应相关的 AA–BC 连续多组分转化中,该反应也扩展到了用途第二个苯胺作为C-4取代基。这种不寻常的反式立体化学可以通过分子内氢键稳定相应的中间体来解释。 4-苯胺基取代基的存在使得该方法能够通过在甲醇中用 FeCl3 处理来自 MCR 的粗产物来合成 4-未取代的 2-芳基喹啉。