for the synthesis of 1,1-diarylethylenes using palladium catalysis has been developed. The new catalyticsystem based on Pd/Xphos–SO3Na or Pd/MeDavephos–CF3SO3 in PEG/H2O under microwave irradiation was found to be the best conditions for this transformation. The recyclability of the palladium catalyst system was also studied, and it was found to be active over nine runs without significant loss in its
已开发出一种绿色的Barluenga-Valdés交叉偶联反应,利用钯催化合成1,1-二芳基乙烯。发现在微波辐射下,基于PEG / H 2 O中Pd / Xphos-SO 3 Na或Pd / MeDavephos-CF 3 SO 3的新催化体系是该转化的最佳条件。还对钯催化剂体系的可回收性进行了研究,发现钯催化剂体系在九次运行中均具有活性,而活性没有明显损失。
Photo-induced oxidative cleavage of C-C double bonds of olefins in water
The carbonyl compounds, synthesized by the oxidative cleavage of their corresponding olefins, are of great significance in organic synthesis, especially aryl ketones. We have developed a gentle and effective protocol, using acid red 94 as the organic metal-free photocatalyst, O2 as the oxidant, and water as the solvent. Under visible light irradiation, aryl ketone derivatives were obtained in moderate
A novel and efficient method for the olefination of carbonyl compounds with Grignard reagents in the presence of diethyl phosphite
作者:Tongqiang Wang、Yuanyuan Hu、Songlin Zhang
DOI:10.1039/c001931c
日期:——
The widely available carbonyl compounds react with Grignardreagents in the presence of diethyl phosphite to give the corresponding olefins in good to excellent yields: A range of conjugated dienes, terminal olefins, multisubstituted-alkenes and conjugated enynes could be readily obtained by the method in mild conditions.
Efficient syntheses and antimicrobial activities of new thiophene containing pyranone and quinolinone derivatives using manganese(<scp>iii</scp>) acetate: the effect of thiophene on ring closure–opening reactions
The syntheses of a new series of pyranones, namely, fused pyranones and quinoline-based dihydrofurans, accompanied by 3-alkenyl-substituted structures were investigated. The products were regioselectively formed by Mn(III)-mediated oxidation at elevated temperature in excellent yields. The effects of the thiophene group and reaction temperature and time on product distributions were investigated. The
研究了一系列新的吡喃酮,即稠合的吡喃酮和喹啉基二氢呋喃,并伴有3-烯基取代的结构。该产物通过Mn(III)介导的氧化在高温下区域选择性地形成,具有优异的产率。研究了噻吩基团,反应温度和时间对产物分布的影响。合成的化合物的结构根据光谱学(IR,1 H NMR,13 C NMR,COSY,HSQC,HMBC和元素分析)和X射线晶体学数据确定。另外,体外使用圆盘扩散法测试了一些合成的二氢呋喃对G(+)和G(-)细菌的抗菌活性。结果表明,含有噻吩基团的化合物显示出比某些常用抗生素更好的抗菌作用。