Photochemistry of Flavonoids. V. Photocyclization of 2-Styryl-4H-chromen-4-ones

Photochemistry of Flavonoids. V. Photocyclization of 2-Styryl-4H-chromen-4-ones

Irradiation of 2-styryl-4H-chromen-4-ones (1) with a high pressure Hg lamp at room temperature under air gave benzo [α] xanthones (2). The cyclization of methoxy-substituted styrylchromones occurred at the para position relative to the OMe group on the styryl ring, whereas 2-[β-(2-naphthyl) vinyl] c...

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Veröffentlicht in:Chemical & pharmaceutical bulletin 1981/09/25, Vol.29(9), pp.2670-2674
Hauptverfasser: YOKOE, ICHIRO, HIGUCHI, KYOKO, SHIRATAKI, YOSHIAKI, KOMATSU, MANKI
Format: Artikel
Sprache:eng
Schlagworte:
polyaromatic xanthene derivatives
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Zusammenfassung:Irradiation of 2-styryl-4H-chromen-4-ones (1) with a high pressure Hg lamp at room temperature under air gave benzo [α] xanthones (2). The cyclization of methoxy-substituted styrylchromones occurred at the para position relative to the OMe group on the styryl ring, whereas 2-[β-(2-naphthyl) vinyl] chromone (3) cyclized at the α-position of the naphthalene ring.
ISSN:0009-2363
1347-5223
DOI:10.1248/cpb.29.2670