- Photochemical synthesis of benzopyrimidosemibullvalenesfrom benzopyrimidobarrelenes
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UV irradiation (λ=254 nm) of 5-fluoro-1,3-dimethyluracil with naphthalene afforded a novel benzopyrimidosemibullvalene derivative with H and F atoms remaining intact on the newly constructed moiety. It was found that the semibullvalene could be derived from the initially produced barrelene derivative during irradiation.
- Ohkura, Kazue,Kudo, Mikiko,Ishihara, Tetsuya,Nishijima, Ken-ichi,Seki, Koh-ichi
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p. 2583 - 2586
(2007/10/03)
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- The photocycloaddition reactions of uridine and related compounds with 2,3-dimethyl-2-butene
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The photochemical reactions of uracil and 5-fluorouracil derivatives with simple alkenes have been investigated. Photocycloaddition of uracil or 5-fluorouracil derivatives and 2,3-dimethyl-2-butene in acetone gave an enantiomeric mixture of cross cycloadducts (4, 7) in moderate yields. Under similar conditions, diastereomers of 4-substituted 7,7,8,8-tetramethyl-cis-2,4-diazabicyclo[4.2.0]octane-3,5-dione nucleosides (14-17) were formed from uridine or 5-fluorouridine derivatives in good yields. The structures and stereochemistry of these cycloadducts of the nucleoside series were elucidated on the basis of the proton nuclear magnetic resonance spectra and X-ray crystallographic analysis.
- Ishikawa,Itoh,Takayanagi,Oshima,Kawahara,Mizuno,Ogura
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p. 1922 - 1930
(2007/10/02)
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