A Concise One-Pot Synthesis of 3,4-Diaryl-1H-pyrazoles from Natural Isoflavones and Hydrazine Hydrate
作者:Zun-Ting Zhang、Da-Jin Tan、Dong Xue
DOI:10.1002/hlca.200790217
日期:2007.11
An efficient protocol has been developed for the preparation of a series of new 3,4-diaryl-1H-pyrazoles, potential pharmacological and agricultural targets, by the reaction of hydrazine hydrate with different natural isoflavones or their derivatives. The target compounds were obtained in good-to-excellent yields (80–95%; Table 2) under fairly mild reaction conditions (80°) tolerating various functional
通过使水合肼与不同的天然异黄酮或其衍生物反应,已经开发了一种有效的方案,用于制备一系列新的3,4-二芳基-1 H-吡唑类,具有潜在的药理学和农业目标。在耐受各种官能团的相当温和的反应条件(80°)下,以良好至优异的收率(80-95%;表2)获得了目标化合物。完全表征了这些新化合物,并确定了3,5-二乙氧基-2- [4-(4-乙氧基苯基)-1 H-吡唑-3-基]苯酚(26)的单晶X射线结构过乙酰化的化合物2- 1-乙酰基-4- [4-乙酰氧基-3-(二乙酰氨基)苯基] -1 H-吡唑-3-基} -5-乙酰氧基苯乙酸(35)已解决(图)。