Allenes. Part 39. The synthesis of 3-alkyl-5-aminopyrazoles and 3H-indoles from allenic or acetylenic nitriles
作者:Z. Tanee Fomum、Stephen R. Landor、Phyllis D. Landor、George W. P. Mpango
DOI:10.1039/p19810002997
日期:——
Hydrazine adds to allenic or acetylenic nitriles to give 3-alkyl-substituted 5-aminopyrazoles in excellent yields. Conjugated and unconjugated enaminic nitriles may be isolated from the Michael addition of phenylhydrazine to allenic nitriles and ring-closed to give 3-alkyl-5-amino-N-phenylpyrazoles and 3H-indoles.
肼添加到烯丙基或炔基腈中,以优异的收率得到3-烷基取代的5-氨基吡唑。可以从苯肼的迈克尔加成到烯丙基腈中分离共轭和未共轭的烯胺腈,并闭环得到3-烷基-5-氨基-N-苯基吡唑和3 H-吲哚。