Journal
GREEN CHEMISTRY
Volume 2, Issue 4, Pages 165-172Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b003752o
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A study on the behaviour of vinylpyrazoles, pyrazolyl imines and pyrazolyl hydrazones as dienes or dipoles is reported. Cycloaddition of the aforementioned compounds with electron-poor reagents under microwave irradiation in solvent-free conditions permits the preparation of indazoles, pyrazolopyridines and bipyrazoles in moderate to good yields. This represents an eco-friendly, green approach to these valuable pyrazole derivatives that avoids the harsh or highly contaminant conditions involving classical heating and offers a reduction or even elimination of solvent use and recovery, simplification of the work up procedures, facility of scale up and savings in energy consumption, in addition with higher yields.
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