Compounds of the formula ##STR1## wherein R.sup.1 is H, C.sub.1 -C.sub.3 alkyl, C.sub.3 -C.sub.5 cycloalkyl or C.sub.1 -C.sub.3 perfluoroalkyl; R.sup.2 is H, C.sub.1 -C.sub.6 alkyl optionally substituted by OH, C.sub.1 -C.sub.3 alkoxy or C.sub.3 -C.sub.6 cycloalkyl, or C.sub.1 -C.sub.3 perfluoroalkyl; R.sup.3 is H, C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 alkenyl, C.sub.3 -C.sub.6 alkynyl, C.sub.3 -C.sub.7 cycloalkyl, C.sub.1 -C.sub.6 perfluoroalkyl or (C.sub.3 -C.sub.6 cycloalkyl)C.sub.1 -C.sub.6 alkyl; and Y is chloro, bromo, or fluoro. The above compounds are intermediates useful in the synthesis of certain pyrazolopyrimidinones which inhibit cyclic guanosine 3', 5'-monophosphate phosphodiesterase.
化合物的公式为##STR1##其中R.sup.1是H,C.sub.1-C.sub.3烷基,C.sub.3-C.sub.5环烷基或C.sub.1-C.sub.3
全氟烷基;R.sup.2是H,C.sub.1-C.sub.6烷基,可选择性地被OH,C.sub.1-C.sub.3烷氧基或C.sub.3-C.sub.6环烷基或C.sub.1-C.sub.3
全氟烷基取代,或者C.sub.1-C.sub.3
全氟烷基;R.sup.3是H,C.sub.1-C.sub.6烷基,C.sub.3-C.sub.6烯基,C.sub.3-C.sub.6炔基,C.sub.3-C.sub.7环烷基,C.sub.1-C.sub.6
全氟烷基或(C.sub.3-C.sub.6环烷基)C.sub.1-C.sub.6烷基;Y是
氯,
溴或
氟。上述化合物是合成某些
嘧啶并
嘧啶酮的中间体,这些
嘧啶并
嘧啶酮可以抑制环
鸟苷3',5'-单
磷酸酯酶。