H4SiW12O40: An efficient catalyst for the synthesis of new spiro-[dibenzo[a,i]xanthene-14,3′-indoline]-2′,8,13-triones
作者:Li Min Yang、Zhi Kui Yin、Li Qiang Wu
DOI:10.1016/j.cclet.2012.01.002
日期:2012.3
Novel spiro[dibenzo[a,i]xanthene-14,3'-indoline]-2',8,13-triones were prepared by the three-component reaction of beta-naphthol, isatins, and 2-hydroxy-1,4-naphoquinone in the presence of a catalytic amount of H4SiW12O40. This protocol provides a simple one-step procedure with the advantages of easy work-up, mild reaction conditions and environmentally benign. (C) 2012 Li Qiang Wu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.