Efficient synthesis of cyano-containing multi-substituted indoles catalyzed by lipase

Abstract

BackgroundIndoles are important bioactive compounds that have been extensively studied in organic chemistry. In this work, a green and efficient process for the synthesis of Indoles from 1,3-diketones with fumaronitrile was developed. ResultsUnder optimal conditions (1,3-diketones (0.5 mmol), fumaronitrile (1 mmol), water (2 ml), lipase (15 mg), 30 °C, 24 h), high yields and satisfactory regioselectivity of cyano-containing multi-substituted indoles could be obtained when CRL (C. rugosa lipase) was used as the catalyst. ConclusionThis enzymatic method demonstrates the great potential for the synthesis of indoles and extends the application of enzyme in organic synthesis.