Effective Palladium-Catalyzed Synthesis of Triarylethene-Based Molecules in Aqueous Solution
作者:Yan Zhu、Peng Sun、Hailong Yang、Linhua Lu、Hong Yan、Marc Creus、Jincheng Mao
DOI:10.1002/ejoc.201200577
日期:2012.9
Highly effective and selective Pd-catalyzed coupling reactions of 1,1-dibromo-1-alkenes with various arylboronic acids have been performed in aqueoussolution under mild conditions. The method is simple, economic, and practical for the synthesis of triarylethene-based compounds.
in good to high yields by coupling N-tosylhydrazones (NTHs) with benzylic phosphates as electrophilic partners. The obtained new catalytic system consisted of PdCl2(CH3CN)2/dppp, LiOtBu as a base, and cyclopentyl methyl ether as a green solvent. In addition, we performed a gram-scale transformation using NTH derivatives and benzylic phosphates having a C sp2–Cl bond. The latter was used as a starting
该研究表明,通过将N-甲苯磺酰腙 (NTH) 与磷酸苄基作为亲电伙伴偶联,可以以良好至高产率获得各种具有高化学选择性的二取代和三取代烯烃。得到的新型催化体系由PdCl 2 (CH 3 CN) 2 /dppp、LiO t Bu为碱、环戊基甲基醚为绿色溶剂组成。此外,我们使用 NTH 衍生物和具有 C sp 2 -Cl 键的苄基磷酸酯进行了克级转化。后者被用作关键中间体进一步后功能化的起点。
Aminium radical salt catalyzed desulphurization of thiiranes: An efficient preparation of arylsubstituted olefins
Arylsubstituted olefins are obtained from corresponding thiiranes in high yields under mild conditions by using catalytic amount of tris-(p-bromophenyl)aminium hexachloroantimonate (1) as a single electron transfer (SET) oxidant.