important functionality as it appears in the structures of biologically active compounds. The trichloromethylative olefin cycloaminations are reported. These reactions are triggered by the addition of the trichloromethyl radical, generated from bromotrichloromethane by photoredoxcatalysis, to a double bond. This process facilitates the construction of N-heterocycles having trichloromethyl units.
Achiral Pyridine Ligand-Enabled Enantioselective Radical Oxytrifluoromethylation of Alkenes with Alcohols
作者:Yong-Feng Cheng、Xiao-Yang Dong、Qiang-Shuai Gu、Zhang-Long Yu、Xin-Yuan Liu
DOI:10.1002/anie.201702925
日期:2017.7.17
conceptually novel strategy with achiral pyridine as the ancillary ligand to stabilize high‐valent copper species for the first asymmetric radical oxytrifluoromethylation of alkenes with alcohols under CuI/phosphoric acid dual‐catalysis has been developed. The transformation features mild reaction conditions, a remarkably broad substrate scope and excellent functional group tolerance, offering an efficient
已开发出一种概念上新颖的策略,以手性吡啶为辅助配体,可在Cu I /磷酸双催化下,用醇类稳定烯烃的第一次不对称自由基氧三氟甲基化,以稳定高价铜物种。该转化反应具有温和的反应条件,显着的底物范围和出色的官能团耐受性,为具有α-叔立体中心且具有出色对映选择性的三氟甲基取代的四氢呋喃提供了一种有效的方法。机理研究支持了非手性吡啶作为铜金属上的配体来稳定不对称诱导过程中涉及的关键瞬态反应物种的推测作用。
Synthesis of aryl-substituted aldehydes and ketones via palladium-catalyzed coupling of aryl halides and non-allylic unsaturated alcohols
作者:Richard C. Larock、Wai-Yee Leung、Sandra Stolz-Dunn
DOI:10.1016/s0040-4039(00)70636-8
日期:——
The palladium-catalyzed coupling of aryl halides and non-allylic unsaturatedalcohols affords excellent yields of aryl-substituted aldehydes and ketones.
Studies on Thiourea Catalysed Bromocycloetherification and Bromolactonisations
作者:Venkatachalam Pitchumani、David W. Lupton
DOI:10.1071/ch20184
日期:——
Lewis base catalysed halofunctionalisation reactions of alkenes are well established and allow access to, among others, various oxygen containing heterocycles. By exploiting the known conversion of N-heterocyclic carbenes into the corresponding thioureas it has been possible to prepare and study a range of chiral and non-chiral Lewis base catalysts for such reactions. Although all thiourea catalysts
In contrast to almost all of the known examples of Heck arylation of unsaturated alcohols, which yield predominately β-arylated products, arylation under the Pd-DPPP catalysis in ionic liquid leads preferentially to aryl substitution at the α carbon, providing an easy pathway to this valuable class of olefins.