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Title
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Protic ionic liquid [TMG][Ac] as an efficient, homogeneous and recyclable catalyst for one-pot four-component synthesis of 2H-indazolo[2,1-b]-phthalazine-triones and dihydro-1H-pyrano[2,3-c]-pyrazol-6-ones
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Type
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JournalPaper
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Keywords
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ionic liquidN,N,N,N-tetramethylguanidinium acetate [TMG][Ac]-2H-indazolo[2,1-b]-phthalazine-triones and dihydro-1H-pyrano[2,3-c]-pyrazol-6-ones
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Abstract
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The mildly basic ionic liquidN,N,N,N-tetramethylguanidinium acetate [TMG][Ac] was found to be a very effective basic catalyst for the one-pot, four-component synthesis of 2H-indazolo[2,1-b]phthalazinetriones by condensation of phthalic anhydride, hydrazinium hydroxide, aromatic aldehydes, and dimedone in high yields at 80 C. [TMG][Ac] catalyzed simple and efficient one-pot four-component reaction of Meldrums acid, ethyl acetoacetate, hydrazine hydrate, and aromatic aldehydes to give dihydro-1H-pyrano[2,3-c]pyrazol-6-ones is reported. The ionic liquid could be recycled several times without loss of efficiency with regards to the reaction times and yields.
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Researchers
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Narges Khankhani (Third Researcher), Abbas amini manesh (Second Researcher), Hojat veisi (First Researcher)
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