Studies on enaminonitriles: A new synthesis of 1,3-substituted pyrazole-4-carbonitrile
作者:Said Ahmed Soliman Ghozlan、Ismail Abdelshafy Abdelhamid、Mohamed Hilmy Elnagdi、Hatem Moustafa Gaber
DOI:10.1002/jhet.5570420623
日期:2005.9
1-p-chlorophenylpyrazole-4-carbonitrile (5a) condensed with hydrazine hydrate to yield the bishydrazone 10 and with dimethylformamide dimethylacetal to yield 1-aryl-3-(3-dimethylamino)acryloyl pyrazole-4-carbonitrile (11). This enamine reacts with hydrazine hydrate to yield the pyrazolylpyrazole (12) and with naphthoquinone to yield the 3-naphthofuranoyl pyrazole 13. The pyra-zolyl pyridine derivative 14
3-二乙基氨基丙烯腈(1)与酰肼卤化物(2a-d)反应,得到1,3-二取代的吡唑-4-腈5a-d。乙酰1- p -chlorophenylpyrazole -4-甲腈(5a中与水合肼缩合),得到双腙10和二甲基甲酰胺二甲基缩醛,得到1-芳基-3-(3-二甲基氨基)丙烯酰基吡唑-4-甲腈(11)。该烯胺与水合肼反应,生成吡唑基吡唑(12),与萘醌反应,生成3-萘呋喃酰基吡唑13。对吡唑-唑基吡啶衍生物14进行如下处理。在乙酸铵存在下用乙酰丙酮11。化合物11被加上p -chlorobenzene氯化重氮,得到腙16,将其用还耦合p -chlorobenzenediazonium酰氯,得到的甲簪18。