Stereocontrolled Synthesis of β-Difluoromethylated Materials
摘要:
Investigation of synthetic routes for regio- and stereocontrolled fluorinated materials with a difluoromethyl group, using ethyl bromodifluoroacetate as a starting material, is described. In particular, (E)-difluoromethylated trisubstituted olefins were prepared via the proton migration reaction catalyzed by using fluoride anion. Further, optically active beta-difluoromethyl esters were obtained by the enzymatic resolution.
Catalytic Asymmetric Hydrogenation of α-CF<sub>3</sub>- or β-CF<sub>3</sub>-Substituted Acrylic Acids using Rhodium(I) Complexes with a Combination of Chiral and Achiral Ligands
作者:Kaiwu Dong、Yang Li、Zheng Wang、Kuiling Ding
DOI:10.1002/anie.201307903
日期:2013.12.23
Only the mixture works! Acrylic acid derivatives with CF3 substituents in α or β position were efficiently hydrogenated in the presence of a RhI complex with a chiral secondary phosphine oxide (SPO; see scheme) and an achiral Ph3P as ligands. The corresponding propanoic acid derivatives were obtained with generally high conversion (>99 %) and high enantioselectivity (92–>99 %).
Fluorinated Sulfinates as Source of Alkyl Radicals in the Photo‐Enantiocontrolled β‐Functionalization of Enals
作者:Ricardo I. Rodríguez、Marina Sicignano、José Alemán
DOI:10.1002/anie.202112632
日期:2022.2.21
use of gem-difluoro sulfinates in visible-light photocatalysis for the construction of new C−C bonds in a chiral fashion is presented. This was tackled by rerouting the chemical pathway of alkyl sulfonyl radicals from traditional sulfonylation to alkylation performance. The efficacy of these sulfinates for assisting SO2 extrusion is shown by allowing the installation of CF2-bearing scaffolds, a modern
介绍了宝石-二氟亚磺酸盐在可见光光催化中前所未有的用途,用于以手性方式构建新的 C-C 键。这是通过将烷基磺酰基自由基的化学途径从传统的磺酰化重新路由到烷基化性能来解决的。这些亚磺酸盐有助于 SO 2挤出的功效通过允许安装带有 CF 2的支架来显示,这是制药领域的一项现代任务。
Stereocontrolled Synthesis of β-Difluoromethylated Materials
Investigation of synthetic routes for regio- and stereocontrolled fluorinated materials with a difluoromethyl group, using ethyl bromodifluoroacetate as a starting material, is described. In particular, (E)-difluoromethylated trisubstituted olefins were prepared via the proton migration reaction catalyzed by using fluoride anion. Further, optically active beta-difluoromethyl esters were obtained by the enzymatic resolution.