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[摘要]：2,3-Dihydro-4-(4-methoxybenzoyl)-5-(4-methoxyphenyl)furan-2,3-dione reacted with some alkyl carbamates via p,p'-dimethoxydibenzoylketene intermediate giving new b-tricarbonyl compds., e.g., I. Then, these compds. were converted into 1,3-oxazine-2,4(3H)-dione with urea and 2-thioxo-2,3-dihydropyrimidin-4(1H)-ones with some thiourea derivs., resp. The pyrimidin-4-ones and the oxazine were obtained in good yields. The structures and characterizations of new synthesized compds. were established by the 1H and 13C NMR, IR, UV-VIS spectroscopic data, elemental anal., and X-ray diffraction method. |
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