Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1267095 | Ultrasonics Sonochemistry | 2010 | 6 Pages |
Abstract
A simple, facile, efficient and three-component procedure for the synthesis of spiro[indoline-3,4′-pyrazolo[3,4-b]pyridine]-2,6′(1′H)-diones by the reaction of 4-hydroxycumarin, isatins and 1H-pyrazol-5-amines in water under ultrasonic irradiation is reported. The advantages of this method are the use of an inexpensive and readily available catalyst, easy work-up, good yields, and the use of water as a solvent that is considered to be relatively environmentally benign.
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Authors
Ayoob Bazgir, Somayeh Ahadi, Ramin Ghahremanzadeh, Hamid Reza Khavasi, Peiman Mirzaei,