Journal
TETRAHEDRON LETTERS
Volume 52, Issue 52, Pages 7195-7198Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2011.10.136
Keywords
Ultrasound irradiation; Solvent-free conditions; Indazolo[2,1-b]phthalazine-1,6,11-triones; Pyrazolo[1,2-b]phthalazine-5,10-diones; (S)-Camphorsulfonic acid; One-pot three-component reaction
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Funding
- Council of Scientific and Industrial Research (CSIR)
- Department of Science and Technology (DST), New Delhi
- UGC, New Delhi
- CSIR, New Delhi
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A rapid and efficient one-pot three-component protocol for the synthesis of 2H-indazolo[2,1-b]phthalazine-1,6,11-triones 4 and 1H-pyrazolo[1,2-b]phthalazine-5,10-diones 6 has been developed by domino coupling of phthalhydrazide, 1,3-diketones, and aldehydes under solvent-free conditions at 80 degrees C as well as under solvent-free ultrasound irradiation at room temperature promoted by (S)-camphorsulfonic acid. (C) 2011 Elsevier Ltd. All rights reserved.
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