One-step synthesis of 5,6-diaryl pyridine-2(1H)-thiones from isoflavones
作者:Juanjuan Wang、Zunting Zhang、Wenli Wang、Fangfang Liu
DOI:10.1039/c3ob27247h
日期:——
The one-step cyclocondensation of substituted isoflavones with cyanothioacetamide in the presence of sodium hydroxide gave an array of 3-cyano-5,6-diaryl pyridine-2(1H)-thiones in good yields. The procedure involves base-mediated ring opening of the isoflavones and subsequent Knoevenagel condensation between the 1,3-dicarbonyl intermediate generated from the isoflavones and cyanothioacetamide, followed
Facile Synthesis of Diarylpyrazolo[1,5-<i>a</i>]pyrimidine from Isoflavones
作者:Junling Yang、Zunting Zhang、Qing He
DOI:10.1002/jhet.1633
日期:2014.1
A new facile and straightforward method for synthesis of 2-methyl-6,7-diphenyl- pyrazolo[1,5-a]pyrimidines has been described. The cyclocondensation of isoflavones with 3-amino-5-methylpyrazole in the presence of sodium methoxide gave fused 2-methyl-6,7-diphenylpyrazolo[1,5-a]pyrimidines in moderate to good yields. A series of 20 new compounds were obtained and characterized by FT-IR, NMR, and elemental
已经描述了一种合成2-甲基-6,7-二苯基-吡唑并[1,5- a ]嘧啶的简便易行的新方法。在甲醇钠存在下,异黄酮与3-氨基-5-甲基吡唑的环缩合反应以中等至良好的产率得到了稠合的2-甲基-6,7-二苯基吡唑并[1,5- a ]嘧啶。获得了一系列20种新化合物,并通过FT-IR,NMR和元素分析对其进行了表征。
Transient and Recyclable Halogenation Coupling (TRHC) for Isoflavonoid Synthesis with Site‐Selective Arylation
作者:Jie‐Ping Wan、Zhi Tu、Yuyun Wang
DOI:10.1002/chem.201901025
日期:2019.5.17
designed for the synthesis of isoflavonoids through the domino reactions of o‐hydroxyphenyl enaminones and aryl boronic acids in the presence of catalytic KI and Pd catalyst. Instead of the conventional cross‐coupling strategy employing pre‐halogenated substrates, this method transforms raw C−H bond by means of a transient C−H halogenation to smoothly relay the subsequent C‐arylation. Consequently, such
Abstract This paper reports the use of rhodium (Rh) catalysts for the oxidative coupling reaction between phenylacetylene and benzaldehyde derivatives viaC-Hbondactivation. These reactions were catalyzed by Rh(l-amino acid)(cod) (the l-amino acid is l-phenylalanine, l-valine or l-proline; cod is 1,5-cyclooctadiene) to obtain chromones in 12.7–88.3% yield. These new Rh catalysts have excellent activity
Recyclable Palladium-Catalyzed Carbonylative Cyclization of Aryl Iodides and 2-Hydroxyacetophenones towards Flavones
作者:Mingzhong Cai、Bin Huang、Gang Xie、Jianan Zhan
DOI:10.1055/s-0042-1753042
日期:2023.2
A highly efficient heterogeneous palladium-catalyzedcarbonylative cyclization of aryl iodides and 2-hydroxyacetophenones is developed. The reaction proceeds efficiently in DMSO at 120 °C under 3 bar of carbon monoxide by using 2 mol% of an MCM-41-immobilized bidentate phosphine palladium complex [MCM-41-2P-Pd(OAc)2] as the catalyst and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as the base, providing