Synthesis of Important New Pyrrolo[3,4-c]Pyrazoles and Pyrazolyl-Pyrrolines from Heterocyclic β-Ketonitriles
作者:Fathy Abdel-Kader Amer、Metwally Hammouda、Abdel-Aziz Sayed El-Ahl、Bakr Fathy Abdel-Wahab
DOI:10.1002/jccs.200700217
日期:2007.12
Treatment of heterocyclic β-ketonitriles la,b with hydrazine hydrate and phenylhydrazine afforded the hydrazine derivatives 2a-d which cyclized in PPA into pyrrolo[3,4-c]pyrazoles 3a-d. Reaction of 1a,b with cyanoacetohydrazide furnished the cyanoacetyl pyrrolo[3,4-c]pyrazoles 4a,b. The hydrazine 2c reacted with p-diketone and (3-ketoesters to afford pyrazolyl-pyrrolines 5-7. Also the later hydrazine
用水合肼和苯肼处理杂环β-酮腈la,b得到肼衍生物2a-d,其在PPA中环化成吡咯并[3,4-c]吡唑3a-d。1a,b 与氰基乙酰肼反应得到氰基乙酰基吡咯并[3,4-c]吡唑 4a,b。肼 2c 与对二酮和 (3-酮酯) 反应得到吡唑基吡咯啉 5-7。随后的肼与一些 D-醛糖和苯乙酮反应分别得到相应的腙 10-12 和肼甲酰胺衍生物 15a、b .