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Synthesis of 3-aryl- or 3-alkenyl-4,6-dimethyl-2-pyrones by silver ion promoted rearrangement of 4-aryl- or4-alkenyl-3-bromo-4,6-dimethyl-3,4-dihydro-2-pyrones

✍ Scribed by Takashi Kume; Hideharu Iwasaki; Yohsuke Yamamoto; Kin-ya Akiba

Publisher: Elsevier Science
Year: 1988
Tongue: French
Weight: 244 KB
Volume: 29
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)82125-5

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✦ Synopsis

Debromination of rl-aryl-or 4-alkenyl-3-bromo-4,6-dimethyl-3,4dihydro-2-pyrone (1) with AgSbF in dichloromethane or 1,2-dichloroethane induced rearrangement of the argl or alkenyl group to the 3-position to afford the corresponding 3-substituted 2-pyrone (5) in high yield.

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