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 hydrazinehydrate with different naturalisoflavones 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
Kudzuisoflavone-A was successfully synthesised via oxidativedimerisation of daidzein in the presence of cuprous chloride. Appropriately substituted isoflavones also undergo regioselective oxidativedimerisation when treated with thallium trifluoroacetate to give novel 6′,6′″-biisoflavones in good yield. A rationale for the regioselectivity is proposed.
One-Step Synthesis of Diarylpyrazolo[3,4-<i>b</i>]pyridines from Isoflavones
作者:Zun-Ting Zhang、Yong Liang、Yu-Qing Ma、Dong Xue、Jun-Ling Yang
DOI:10.1021/cc1000506
日期:2010.7.12
A new concise, facile, and efficient method for the synthesis of 3-hydroxy-5,6-diphenylpyrazolo[3,4-b]pyridine derivatives has been described. The cyclocondensation of isoflavones with 3-amino-5-hydroxypyrazole in the presence of sodium methoxide gave fused heteroaromatic 3-hydroxy-5,6-diphenylpyrazolo[3,4-b]pyridines in moderate to good yields.
已经描述了一种合成3-羟基-5,6-二苯基吡唑并[3,4- b ]吡啶衍生物的简洁,简便而有效的新方法。在甲醇钠存在下,异黄酮与3-氨基-5-羟基吡唑的环缩合反应以中等至良好的产率得到了稠合的杂芳族3-羟基-5,6-二苯基吡唑并[3,4- b ]吡啶。
Microwave Irradiation for Accelerating Synthesis of 5,6-Diphenylimidazo[1,2-<i>a</i>]pyrimidines Based on Isoflavones
作者:Wen-Yong Han、Zun-Ting Zhang、Li Qiu、Gang Li
DOI:10.1080/00397911.2010.516411
日期:2011.12.15
Abstract Microwaveirradiation was used to accelerate the cyclocondensation of isoflavones with 2-aminoimidazole to synthesize 5,6-diphenylimidazo[1,2-a]pyrimidines. A series of 17 new compounds were characterized by Fourier transform infrared, NMR, and elemental analysis. 5-(2-Hydroxyl-4-isopropoxyphenyl)-6-phenylimidazo-[1,2-a]pyrimidine was determined by x-ray diffraction. A variety of substrates