Journal of Heterocyclic Chemistry p. 1189 - 1193 (1999)
Update date:2022-08-16
Topics:
Sato, Shingo
Watanabe, Takeshi
Kumagai, Hironobu
Kitamura, Nobuo
Matsuba, Shigeru
Kumazawa, Toshihiro
Onodera, Jun-Ichi
Suzuki, Masanobu
Condensation of 2-hydroxyacetophenone with benzaldehyde in the presence of 70% perchloric acid in ethyl orthoformate gave the corresponding 4- ethoxyflavylium perchlorate, which was treated with aqueous ammonia or methylamine solution to afford 1,6,7,8-su
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