Rh(III)-Catalyzed C(8)–H Functionalization of Quinolines via Simultaneous C–C and C–O Bond Formation: Direct Synthesis of Quinoline Derivatives with Antiplasmodial Potential
作者:Ritika Sharma、Rakesh Kumar、Rohit Kumar、Pooja Upadhyay、Dinkar Sahal、Upendra Sharma
DOI:10.1021/acs.joc.8b02042
日期:2018.10.19
Here, a facile and efficient protocol for the synthesis of 3-hydroxyquinolin-8-yl propanoates via Rh(III)-catalyzed C(8)–H activation of 2-substituted quinolines has been developed. The reaction proceeds via C(8)–H activation, functionalization with acrylates, followed by intramolecular migration of the oxygen atom from quinoline N-oxides to the acrylate moiety. In this approach, N-oxide plays a dual
在这里,已经开发了一种通过Rh(III)催化2-取代的喹啉的C(8)-H活化合成3-羟基喹啉-8-丙酸酯的简便有效的方法。反应通过C(8)-H活化,丙烯酸酯官能化进行,然后氧原子从喹啉N-氧化物分子内迁移到丙烯酸酯部分。用这种方法,N氧化物起着无痕导向基团的双重作用,同时也是羟基化的氧原子来源。这种催化方法涉及同时形成新的C–C和C–O键,并且仅适用于C2取代的喹啉。具有催化活性的五元罗丹环已被表征,因此揭示了催化循环中的关键中间体。在针对Falcipan-2的计算机对接研究中,发现3a,3b,3g和3m的得分更高。体外针对CQ敏感pf 3D7和CQ耐药pf INDO菌株的所选化合物的体外评估提供了3d(IC 50 13.3μM)和3g(IC 50 9.5μM)在体外培养中对恶性疟原虫有良好的前景。根据体外抗血浆活性[IC 50 9.5μM(Pf 3D7)和11.9μM(Pf INDO),耐药指数1