The reaction of bis(chalcones) 1a−d and bis(chalcone) tetrabromo derivatives 3a−d with hydrazine hydrate gave bis(pyrazolines) 4a−d and bis(pyrazoles) 5a−d, respectively. Bis(pyrazoles) 5e,f bearing hydroxyphenyl substituents have been prepared from the reaction of bis(chromones) 6c,d with hydrazine hydrate, because their synthesis from the corresponding benzyloxy-substituted 5c,d gave very poor yields
双(
查耳酮)1a-d 和双(
查耳酮)四
溴衍
生物 3a-d 与
水合
肼的反应分别得到双(
吡唑啉)4a-d 和双(
吡唑)5a-d。带有羟基苯基取代基的双(
吡唑) 5e,f 已由双(
色酮) 6c,d 与
水合
肼的反应制备,因为它们由相应的苄氧基取代的5c,d 合成的产率非常低。所有新化合物的结构都已通过广泛的 NMR 光谱研究确定。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)