Abstract
Multicomponent cyclocondensations between 5-aminopyrazoles, barbituric
acids, and aromatic aldehydes under conventional thermal heating,
microwave irradiation, or ultrasonic irradiation were studied and
the temperature regime was found to be the main factor in controlling
their chemoselectivity. At high temperatures the starting materials
react in two different ways yielding pyrazolo[4′,3′:5,6]pyrido[2,3-d ]pyrimidines or their dihydro
analogues depending on the nature of the N-substituent in the 5-aminopyrazole.
Treatment at room temperature results in a new four-component reaction
giving previously undisclosed heterocyclic compounds, 4,6-diaryl-1,4,6,7-tetrahydro-2′H -spiro[pyrazolo[3,4-b ]pyridine-5,5′-pyrimidine]s.
Facile multipurpose three-component selective procedures to new
spiroheterocycles are proposed.
Key words
heterocycles - multicomponent reactions - selectivity - ultrasonication - microwave-assisted
synthesis
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