Decarboxylative Trifluoromethylation of Aliphatic Carboxylic Acids
作者:Jacob A. Kautzky、Tao Wang、Ryan W. Evans、David W. C. MacMillan
DOI:10.1021/jacs.8b02650
日期:2018.5.30
conversion of carboxylicacids to trifluoromethyl groups via the combination of photoredox and copper catalysis. This transformation tolerates a wide range of functionality including heterocycles, olefins, alcohols, and strained ring systems. To demonstrate the broad potential of this new methodology for late-stage functionalization, we successfully converted a diverse array of carboxylic acid-bearing
Synthesis of Trifluoromethyl-Substituted Cyclopropanes via Sequential Kharasch–Dehalogenation Reactions
作者:Julie Risse、Mariano A. Fernández-Zúmel、Yanouk Cudré、Kay Severin
DOI:10.1021/ol3011369
日期:2012.6.15
A two-step process for the synthesis of trifluoromethyl-substituted cyclopropanes is described. Halothane, an anesthetic agent, is added to olefins in a ruthenium-catalyzedKharaschreaction. The resulting 1,3-dihalides are converted into cyclopropanes by dehalogenation with magnesium. This procedure represents an alternative to metal-catalyzed cyclopropanations involving trifluoromethyl diazomethane
A range of alkenes have been converted in a single step into the corresponding trifluoromethyl-substituted cyclopropanes by treatment with 2-diazo-l,l,l-trifluoroethane over metal catalysts. Application of the Gaspar-Roth procedure allowed the preparation of target compounds on a multi-gram scale. The practical utility of this reaction has been demonstrated by the synthesis of both diastereoisomers
Iron-Catalyzed Cyclopropanation with Trifluoroethylamine Hydrochloride and Olefins in Aqueous Media: In Situ Generation of Trifluoromethyl Diazomethane
作者:Bill Morandi、Erick M. Carreira
DOI:10.1002/anie.200905573
日期:2010.1.25
Let's avoid the risk! The title transformation has been developed for the synthesis of trifluoromethyl‐substituted cyclopropane derivatives (see scheme). It avoids the preparation of trifluoromethyldiazomethane and merges a number of areas: water as a reaction medium, iron catalysis, and access to reactive intermediates under operationally safe conditions.
Iron(III)-based metalloradical catalysis for asymmetric cyclopropanation via a stepwise radical mechanism
作者:Wan-Chen Cindy Lee、Duo-Sheng Wang、Yiling Zhu、X. Peter Zhang
DOI:10.1038/s41557-023-01317-8
日期:2023.11
initial application for asymmetric radical transformations. Specifically, we report that five-coordinate iron(III) complexes of porphyrins with an axial ligand, which represent another family of stable 15e-metalloradicals with a d5 configuration, are potent metalloradical catalysts for olefin cyclopropanation with different classes of diazocompounds via a stepwise radical mechanism. This work lays a foundation