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 .