The addition of hydrazine to functionalizedfurans 2a–d leads to a variety of 4,4′-bipyrazoles 4a–c depending on the structure of the starting materials. In one example, compound 2c was first converted to an intermediate, furo[3,4-d]pyridazine 3c which was then transformed into 4,4′-bipyrazole 4c on reacting with hydrazine.
根据原料的结构,将肼添加到官能化的呋喃2a - d中可生成各种4,4'-联吡唑4a - c。在一个实施例中,首先将化合物2c转化为中间体呋喃并[3,4- d ]哒嗪3c,然后与肼反应将其转化为4,4'-联吡唑4c。
Westoeoe, Acta Chemica Scandinavica (1947), 1959, vol. 13, p. 683,687