The Reactions of Benzylmalononitriles with Hydrazine and Hydroxylamine. Synthesis of Pyrazoles, Isoxazoles, and Pyrazolo[1,5-<i>a</i>]-pyrimidine Derivatives
作者:Juan J. Vaquero、Luis Fuentes、Juan C. Del Castillo、María I. Pérez、José L. García、José L. Soto
DOI:10.1055/s-1987-27831
日期:——
Benzylmalononitriles react with hydrazine or hydroxylamine to give 4-substituted 3,5-diaminopyrazoles or isoxazoles, respectively. Pyrazolo[1,5-a]pyrimidine derivatives are prepared by reaction of these pyrazoles with some 2,3-disubstituted propenenitriles (including benzylidenemalononitrile) under mild conditions.
苄基丙二腈与肼或羟胺反应,分别生成 4-取代的 3,5-二氨基吡唑或异噁唑。 在温和的条件下,这些吡唑与一些 2,3-二取代的丙烯腈(包括亚苄基丙二腈)反应,制备出吡唑并[1,5-a]嘧啶衍生物。