H4SiW12O40: An efficient catalyst for the synthesis of new spiro-[dibenzo[a,i]xanthene-14,3 '-indoline]-2 ',8,13-triones

作者：Yang, Li Min; Yin, Zhi Kui; Wu, Li Qiang^*

来源：Chinese Chemical Letters, 2012, 23(3): 265-268.

DOI：10.1016/j.cclet.2012.01.002

• Spiro[dibenzo[a,i]xanthene-14,3'-indoline]
• beta-Naphthol
• 2-Hydroxy-1,4-naphoquinone
• H4SiW12O40
• Solvent-free

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.

• 出版日期2012-3
• 单位新乡医学院