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Communication | Regular issue | Vol 51, No. 3, 1999, pp.493-496
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8429
Et2AlCl Promoted Coupling Reactions of 4-Hydroxy-2-pyrone or 4-Hydroxycoumarine with Aldehydes: Synthesis of Methylenebis-(4-hydroxy-2-pyrone) or Methylenebis-(4-hydroxycoumarine) Derivatives

Hisahiro Hagiwara,* Shigeki Miya, Toshio Suzuki, Masayoshi Ando, Isao Yamamoto, and Michiharu Kato

*Graduate School of Science and Technology, Nigata University, 8050, 2 no-cho, Ikarashi, Nigata 950-2181, Japan


Methylenebis(4-hydroxy-2-pyrone) or methylenebis(4-hydroxy-coumarin) derivatives (5) have been synthesized from 4-hydroxy-2-pyrones (6) and (8) or 4-hydroxycoumarine (10) with aldehydes (4) in the presence of diethylaluminum chloride.