A highly efficient synthesis of azaarene-substituted 3-hydroxy-2-oxindoles in catalyst-free conditions is described by the reaction of 2-methyl pyridines with isatins under microwave irradiation in aqueous medium. Simple reaction conditions, high yields of the products and environmentally benign medium are attractive features of the present protocol.
A novel and efficient synthesis of azaarene-substituted 3-hydroxy-2-oxindoles via sp3 C–H functionalization of 2-methyl azaarenes and (2-azaaryl)methanes over a heterogeneous, reusable silica-supported dodecatungstophosphoric acid catalyst
作者:Shafeek A. R. Mulla、Mohsinkhan Y. Pathan、Santosh S. Chavan
DOI:10.1039/c3ra43515f
日期:——
A novel and efficient protocol has been developed for the synthesis of azaarene-substituted 3-hydroxy-2-oxindoles via sp3 CâH functionalization of 2-methyl azaarenes and (2-azaaryl)methanes with isatin in good to excellent yield. This is the first example in which heterogeneous, reusable silica supported dodecatungstophosphoric acid (DTP/SiO2) catalyzed sp3 CâH functionalization of 2-substituted azaarenes and (2-azaaryl)methanes.
The invention relates to substituted heteroaryl derivatives, to methods for the production thereof, to medicaments containing said compounds and to the use of substituted heteroaryl derivatives for producing medicaments.
A simple and sustainable tetrabutylammonium fluoride (TBAF)-catalyzed synthesis of azaarene-substituted 3-hydroxy-2-oxindoles through sp<sup>3</sup> C–H functionalization
A green, practical, and metal-free protocol for direct addition of α-and γ-alkylazaarenes to isatins has been developed via sp3 C–H functionalization in water under controlled microwave radiation. This methodology provides a mild and fast route to biologically important azaarene-substituted 3-hydroxy-2-oxindoles in good to excellent yields.
3-Alkyl-3-hydroxyoxindoles, a subclass of oxindole products, have antioxidant, neuroprotective, anticancer, and anti-HIV activities. In this study, a green and economical protocol for the synthesis of 3-alkyl-3-hydroxyoxindoles is developed for the first time via α-alkylation-α-hydroxylation of oxindole with benzyl alcohols without using any transition-metal catalysts in yields of 29–93%.
3-Alkyl-3-hydroxyoxindoles 是 oxindole 产品的一个子类,具有抗氧化、神经保护、抗癌和抗 HIV 活性。在这项研究中,首次开发了一种绿色和经济的合成 3-烷基-3-羟基吲哚的方案,该方案通过用苯甲醇对羟基吲哚进行 α-烷基化-α-羟基化,而不使用任何过渡金属催化剂,收率 29 –93%。