Flavonoids Syntheses. V. Synthesis of Flavonoids with Three Hydroxy and Four Methoxy Groups and Their Spectral Properties

MUNEKAZU IINUMA; TOSHIYUKI TANAKA; KAZUHIRO ITO; MIZUO MIZUNO

doi:10.1248/cpb.35.660

MUNEKAZU IINUMA, TOSHIYUKI TANAKA, KAZUHIRO ITO, MIZUO MIZUNO

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Keywords: flavone synthesis, trihydroxy-tetramethoxyflavone, 2', 3', 4', 5, 6, 6', 7-heptaoxy-genated flavone, 2 ', 3 ', 4 ', 5, 6 ', 7, 8-heptaoxygenated flavone, 2 ', 3, 4 ', 5, 5 ', 6, 7-heptaoxygenated flavone, 2', 3, 4', 5, 5', 7

JOURNAL FREE ACCESS

1987 Volume 35 Issue 2 Pages 660-667

DOI https://doi.org/10.1248/cpb.35.660

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Abstract

Twelve flavonoids with three hydroxy and four methoxy groups located at C-2', 3', 4', 5, 6, 6', 7 (1-4), C-2', 3', 4', 5, 6', 7, 8 (5), C-2', 3, 4', 5, 5', 6, 7 (6-11) and C-2', 3, 4', 5, 5', 7, 8 (12) were synthesized to confirm the structure of NAS-3 and to investigate the spectral properties of the hepta-oxygenated flavonoids. The methods used to prepare the tetra-oxygenated benzaldehydes (14-19) for the B ring moieties are also described.

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