Chitosan, a reusable heterogeneous catalyst, can be combined with an ionic liquid as a green solvent to generate a highly efficient catalyst system for our densely functionalised and diversified target molecule. The reaction is completed with a good to excellent yield. This procedure demonstrates an eco-friendly catalyst system and eliminates the use of toxic transition metal catalysts, bases and volatile organic solvents, which adversely affect the environment and human beings.
Novel and Efficient One-Pot Synthesis of Spiro[Indoline-3,4′-Pyrano [2,3-c]pyrazole]Derivatives Catalysed by L-Proline in Aqueous Medium
作者:Jiangxia Yu、Yongbing Zhou、Tianhua Shen、Wengang Mao、Kang Chen、Qingbao Song
DOI:10.3184/174751913x13687116634925
日期:2013.6
An efficient mild one-pot synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole derivatives by a four-component reaction of hydrazine, a β-keto ester, isatin, and malononitrile catalysed by L-proline in water is reported.