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Paper | Regular issue | Vol 45, No. 1, 1997, pp.37-44
Published online, 1st January, 1970
DOI: 10.3987/COM-96-7595
Reactions of 1-Substituted 2,2-Difluorostyrenes with Dianions of 1,3-Diketones: Novel Synthesis of 4H-Pyran-4-one Derivatives

Bum Tae Kim, No Kyun Park, Chwang Siek Pak, Myong Sang Kim, and In Howa Jeong*

*Pharmaceutical Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yusung, Daejeon 305-606, Korea

Abstract

Treatment of 1-substituted 2,2-difluorostyrenes with dianions of 1,3-diketones, which are generated via the reaction of 1,3-diketones with 4 equiv. of LDA in THF at -78 °C, resulted in the formation of 4H-pyran-4-one derivatives in moderated yields by warming to 25 °C.