申请人:Sterling Drug Inc.
公开号:US04331671A1
公开(公告)日:1982-05-25
2-R-5-(Py-Y)-1H-benzimidazole or pharmaceutically-acceptable acid-addition salt thereof, useful as a cardiotonic, is prepared by reacting 4-(Py-Y)-1,2-benzenediamine with a tri-(lower-alkyl)ortho-(lower-alkanoate) of the formula R--C(OR.sub.1).sub.3, where R is hydrogen or lower-alkyl, Y is a direct linkage or lower-alkylene having one or two carbon atoms, and Py is 4- or 3-pyridinyl or 4- or 3-pyridinyl having one or two lower-alkyl substituents, or with dimethylformamide dimethyl acetal or dimethylacetamide dimethyl acetal to produce said 2-R-5-(Py-Y)-1H-benzimidazole where R is methyl or ethyl respectively. The same compound where R is lower-alkyl is prepared in two steps by first reacting 4-(Py-Y)-1,2-benzenediamine with an alkanoylating agent providing alkanoyl of the formula ##STR1## to produce N.sub.2 --[R'--C(.dbd.O)]-4-(Py-Y)-1,2-benzenediamine and heating the latter compound to produce said 2-R'-5-(Py-Y)-1H-benzimidazole, where R' is lower-alkyl. Also shown is 1-hydroxy-2-R-6-(Py-Y)-1H-benzimidazole or pharmaceutically-acceptable acid-addition salt thereof, useful as a cardiotonic and prepared by reacting 3-nitro-N-(RCO)-4-(Py-Y)-benzeneamine with hydrogen under catalytic hydrogen conditions.
2-R-5-(Py-Y)-1H-苯并咪唑或其药用酸盐,可用作心脏强心剂,通过将4-(Py-Y)-1,2-苯二胺与式为R-C(OR1)3的三-(低烷基)邻-(低烷酸酯)反应制备而成,其中R为氢或低烷基,Y为直链或低烷基烷基,具有一个或两个碳原子,Py为4-或3-吡啶基或4-或3-吡啶基,具有一个或两个低烷基取代基,或与二甲基甲醛二甲基缩醛或二甲基乙酰胺二甲基缩醛反应以产生所述的2-R-5-(Py-Y)-1H-苯并咪唑,其中R分别为甲基或乙基。当R为低烷基时,通过首先将4-(Py-Y)-1,2-苯二胺与提供式为N2-[R'-C(.dbd.O)]-4-(Py-Y)-1,2-苯二胺的脂肪酰化剂反应,以产生脂肪酰基,然后加热后者化合物以产生所述的2-R'-5-(Py-Y)-1H-苯并咪唑,其中R'为低烷基。此外,还显示了1-羟基-2-R-6-(Py-Y)-1H-苯并咪唑或其药用酸盐,可用作心脏强心剂,并通过在催化氢条件下将3-硝基-N-(RCO)-4-(Py-Y)-苯胺与氢反应制备而成。