专利号:US-5719283-A 优先权日:1990-06-20 标 题:Intermediates useful in the synthesis of pyrazolopyrimidinone antianginal agents 发明人:BELL ANDREW SIMON; BROWN DAVID; TERRETT NICHOLAS KENNETH 权利人:PFIZER 摘要:Compounds of the formula ##STR1## wherein R 1 is H, C 1 -C 3 alkyl, C 3 -C 5 cycloalkyl or C 1 -C 3 perfluoroalkyl; n R 2 is H, C 1 -C 6 alkyl optionally substituted by OH, C 1 -C 3 alkoxy or C 3 -C 6 cycloalkyl, or C 1 -C 3 perfluoroalkyl; n R 3 is H, C 1 -C 6 alkyl, C 3 -C 6 alkenyl, C 3 -C 6 alkynyl, C 3 -C 7 cycloalkyl, C 1 -C 6 perfluoroalkyl or (C 3 -C 6 cycloalkyl)C 1 -C 6 alkyl; n and Y is chloro, bromo, or fluoro. n The above compounds are intermediates useful in the synthesis of certain pyrazolopyrimidinones which inhibit cyclic guanosine 3', 5'-monophosphate phosphodiesterase.
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合成参考文献
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