Palladium-Catalyzed Cascade CH Trifluoroethylation of Aryl Iodides and Heck Reaction: Efficient Synthesis of<i>ortho</i>-Trifluoroethylstyrenes
作者:Hao Zhang、Pinhong Chen、Guosheng Liu
DOI:10.1002/anie.201403793
日期:2014.9.15
A palladium‐catalyzed selective CH bond trifluoroethylation of aryl iodides has been explored. The reaction allows for the efficient synthesis of a variety of ortho‐trifluoroethyl‐substituted styrenes. Preliminary mechanisticstudies indicate that the reaction might involve a key PdIV intermediate, which is generated through the rate‐determining oxidative addition of CF3CH2I to a palladacycle; the
synthesis of functionalized alkyl aryl ketones is reported. Studies on the electronic and steric properties of mixed aryl anhydrides indicated that the cross-coupling favored with the electron-enriched aryl acyl group. DFT calculation on the oxidative addition of Pd(II) with 2,4,6-(Cl)3C6H2CO2C(O)Ph suggested that 2,4,6-(Cl)3C6H2C(O)–O bond cleavage was more kinetically disfavored than that of the PhC(O)–O
报道了钯/降冰片烯催化的邻位酰化,用于有效合成官能化的烷基芳基酮。对混合的芳基酸酐的电子和空间特性的研究表明,交叉偶联有利于富电子的芳基酰基。用2,4,6-(Cl)3 C 6 H 2 CO 2 C(O)Ph氧化Pd(II)的DFT计算表明2,4,6-(Cl)3 C 6 H 2 C (O)–O键的断裂在动力学上比PhC(O)–O键的断裂更不利于11.7 kJ / mol。
Indazole compounds, pharmaceutical compositions, and methods for mediating or inhibiting cell proliferation
申请人:——
公开号:US20020161022A1
公开(公告)日:2002-10-31
Indazole compounds that modulate and/or inhibit cell proliferation, such as the activity of protein kinases are described. These compounds and pharmaceutical compositions containing them are capable of mediating, e.g., kinases-dependent diseases to modulate and/or inhibit unwanted cell proliferation. The invention is also directed to the therapeutic or prophylactic use of pharmaceutical compositions containing such compounds, and to methods of treating cancer as well as other disease states associated with unwanted angiogenesis and/or cellular proliferation, such as diabetic retinopathy, neovascular glaucoma, rheumatoid arthritis, and psoriasis, by administering effective amounts of such compounds.
To show the synthetic utility of palladium/norbornene (Pd/NBE) cooperativecatalysis, here we report concise syntheses of indenone-based natural products, pauciflorol F and acredinone A, which are enabled by direct annulation between aryl iodides and unsaturated carboxylic acid anhydrides. Compared to the previous indenone-preparation approaches, this method allows simple aryl iodides to be used as
为了展示钯/降冰片烯 (Pd/NBE) 协同催化的合成效用,我们在此报道了基于茚酮的天然产物、少花酚 F 和 acredinone A 的简明合成,这些产物是通过芳基碘化物和不饱和羧酸酐之间的直接成环来实现的。与以前的茚酮制备方法相比,该方法允许使用简单的芳基碘化物作为底物,并完全控制区域选择性。acredinone A 的全合成以两种不同的 Pd/NBE 催化的邻位酰化反应为特征,用于构建五取代的芳烃核心,包括开发新的邻位酰化/原硼酸化。
Direct Annulation between Aryl Iodides and Epoxides through Palladium/Norbornene Cooperative Catalysis
作者:Renhe Li、Guangbin Dong
DOI:10.1002/anie.201712393
日期:2018.2.5
iso‐propyl ester substituted NBE was found to be most efficient to suppress the formation of multiple‐NBE‐insertion byproducts and affords the desired 2,3‐dihydrobenzofuran derivatives in 44–99 % yields. The reaction is scalable and tolerates a range of functional groups. Asymmetricsynthesis is realized using an enantiopure epoxide. Application of this method into a concise synthesis of insecticide