Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (10): 1636-1641.DOI: 10.1016/S1872-2067(11)60414-2

• Research papers • Previous Articles     Next Articles

Yb(OTf)3-Catalyzed Addition of 2-Methyl Azaarenes to Isatins via C–H Functionalization

NIU Rui1, YANG Shiying1, XIAO Jian2,a, LIANG Tao2, LI Xingwei2,b   

  1. 1Key Laboratory of Marine Environment and Ecology, Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, China; 2Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2012-05-15 Revised:2012-06-01 Online:2012-09-28 Published:2012-09-28

Abstract: 3-Substituted-3-hydroxy-2-oxindoles are rich in a range of biologically active natural products and pharmaceuticals and development of efficient methods to construct 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 utility of Lewis acid in the catalytic functionalization of sp3 C–H bonds in organic synthesis.

Key words: ytterbium triflate, Lewis acid, addition, 3-hydroxy-2-oxindole, 2-methylazaarene