已经开发了三氟甲基炔丙基亚胺与二硒化物的自由基硒化环化反应,用于区域发散构建不同功能化的氮杂螺[4,5]-四烯酮和喹啉,这使得能够在一锅反应中将CF 3和 Se 基团双重结合到杂环中。当使用Oxone作为绿色氧化剂时,反应通过氧化脱芳烃自身环化或分子内邻位环化进行,表现出良好的区域选择性。通过放大反应和对所得产物的进一步修饰证明了该方法的合成效用。
已经开发了三氟甲基炔丙基亚胺与二硒化物的自由基硒化环化反应,用于区域发散构建不同功能化的氮杂螺[4,5]-四烯酮和喹啉,这使得能够在一锅反应中将CF 3和 Se 基团双重结合到杂环中。当使用Oxone作为绿色氧化剂时,反应通过氧化脱芳烃自身环化或分子内邻位环化进行,表现出良好的区域选择性。通过放大反应和对所得产物的进一步修饰证明了该方法的合成效用。
enantioselective synthesis of chiral fluorinated propargylamines was developed through phosphoric acid and ruthenium-catalyzed chemoselective biomimetic hydrogenation of the carbon–nitrogen double bond of fluorinated alkynyl ketimines in the presence of a carbon–carbon triple bond. This reaction features high chemoselectivity and slow background reaction. In addition, selective transformations of the chiral fluorinated
alkenes with up to 99% yield and 99% enantiomeric excess (ee). The mechanism of chiral regenerable NAD(P)Hmodels was investigated as well. Isotope-labeling reactions indicated that chiral NAD(P)Hmodels were regenerated by the ruthenium complex under hydrogen gas first, and then the hydride of NAD(P)Hmodels was transferred to unsaturated bonds in the presence of transfer catalysts. In addition, density
Selective synthesis of poly-substituted fluorine-containing pyridines and dihydropyrimidines via cascade C–F bond cleavage protocol
作者:Zixian Chen、Jiangtao Zhu、Haibo Xie、Shan Li、Yongming Wu、Yuefa Gong
DOI:10.1039/c1ob05371j
日期:——
in pharmaceuticals, drugcandidates, ligands for transition metal catalysts, and other molecular functional materials, so efficient methods for the synthesis of these compounds are of significant value. We herein describe a selective strategy for the synthesis of poly-substituted pyridines and fluoroalkyl dihydropyrimidines based on C–Fbond breaking of the anionically activated fluoroalkyl group. An
Palladium-Catalyzed Synthesis of 2-Fluoroalkyl-3-methylene-3H-indoles Through a Domino Carbopalladation/CH Activation Process
作者:Zixian Chen、Jiangtao Zhu、Haibo Xie、Shan Li、Yongming Wu、Yuefa Gong
DOI:10.1002/adsc.201000689
日期:2011.2.11
A novel palladium-catalyzed synthesis of substituted 3-methylene-3H-indoles from readily accessible alkynylimines has been developed. A wide variety of 2-fluoroalkyl-3-methylene-3H-indoles were synthesized in moderate to good yields through this cascade carbopalladation/CHactivation process. This reaction can also be expanded to non-fluorinated substrates.