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Citation:
You Ming WANG, Ke HE, Guo Feng ZHAO, Zheng Ming LI. Condensation Reaction of 5, 6-Dihydro-6-methyl-6-piperonyl-2H-pyran-2,4-dione, Ethyl Orthoformate and Substituted Anilines[J]. Chinese Chemical Letters,
;2003, 14(3): 221-224.
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Piperonyl methyl ketone was obtained by oxidizing isosafrole with hydrogen peroxide and formic acid. Dianion of ethyl acetoacetate reacted with piperonyl methyl ketone and 5, 6-dihydro-6-methyl-6-piperonyl-2H-pyran-2, 4-dione was prepared, which reacted with substituted anilines in the presence of ethyl orthoformate to obtain 3-anilinomethylene-5, 6-dihydro-6-methyl-6-piperonyl-2H-pyran-2, 4-diones. Their structures were confirmed by 1HNMR and elemental analysis.
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Keywords:
- Piperonyl methyl ketone,
- isosafrole,
- dianion
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