Journal
CHINESE CHEMICAL LETTERS
Volume 27, Issue 5, Pages 714-720Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2016.01.016
Keywords
Task specific ionic liquid [bmim]OH; Isatin; Spiro compounds; Green synthesis
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Funding
- University Grants Commission, New Delhi, India
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A rapid and efficient, one pot synthesis of spirooxindole derivatives has been attempted by three component reaction of isatin, malononitrile and carbonyl compound possessing a reactive alpha-methylene group by using task specific ionic liquid, 1-butyl-3-methyl imidazolium hydroxide [bmim]OH as a catalyst. The important features of this methodology are straight forward route in short reaction time at room temperature and avoid any hazardous organic solvent, toxic catalyst, tedious purification step. Interestingly, this protocol is not only limited to mono-systems but also to the synthesis of newer bis-spirooxindole system. The separation of the product and reusability of the catalyst are easy with excellent yield. The [bmim]OH catalyst system could be reused up to five recycles without appreciable loss of activity. (C) 2016 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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