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.
Facile Synthesis of Azaarene-Substituted 3-Hydroxy-2-oxindoles via Brønsted Acid Catalyzed sp<sup>3</sup> C–H Functionalization
作者:Rui Niu、Jian Xiao、Tao Liang、Xingwei Li
DOI:10.1021/ol2030982
日期:2012.2.3
Brønstedacidcatalyzedfunctionalization of sp3 C–H bonds in 2-methyl azaarenes has been achieved in the reaction with isatins. This method provides facile synthesis of biologically important azaarene-substituted 3-hydroxy-2-oxindoles in one step in moderate to good yields.
Iron-catalyzed C(sp<sup>3</sup>)–H functionalization of methyl azaarenes: a green approach to azaarene-substituted α- or β-hydroxy carboxylic derivatives and 2-alkenylazaarenes
作者:Danwei Pi、Kun Jiang、Haifeng Zhou、Yuebo Sui、Yasuhiro Uozumi、Kun Zou
DOI:10.1039/c4ra10939b
日期:——
An iron-catalyzed C(sp3)–H functionalization of methyl azaarenes with carbonyls to access the title compounds have been described.
使用铁催化的C(sp3)-H官能团化方法,将甲基氮杂芳烃与羰基化合物反应,合成了目标化合物。
Yb(OTf)3-Catalyzed Addition of 2-Methyl Azaarenes to Isatins via C-H Functionalization
作者:Rui NIU、Shiying YANG、Jian XIAO、Tao LIANG、Xingwei LI
DOI:10.1016/s1872-2067(11)60414-2
日期:2012.9
this key motif is of vital importance. Yb(OTf)3-catalyzed addition of 2- or 4-methyl azaarenes to isatins via C-H functionalization was developed. Moderate to good yields were obtained for various isatins and azaarenes. This method provides rapid protocol for the synthesis of biologically important azaarene-substituted 3-hydroxy-2-oxindoles in one step. The success of this reaction expands the synthetic