family of practical, liquid trifluoromethylation and pentafluoroethylation reagents is described. We show how halogen bonding can be used to obtain easily handled liquid reagentsfrom gaseous CF3I and CF3CF2I. The synthetic utility of the new reagents is exemplified by a novel direct arene trifluoromethylation reaction as well as adaptations of other perfluoroalkylation reactions.
[EN] FLUOROALKYLATION REAGENTS AND USES THEREOF<br/>[FR] RÉACTIFS DE FLUOROALKYLATION ET LEURS UTILISATIONS
申请人:HARVARD COLLEGE
公开号:WO2015168368A1
公开(公告)日:2015-11-05
Provided herein are halogen-bonded complexes of Formula (I), wherein is a halogen bond; R1 is unsubstituted C1-3 fluoroalkyl; D is N(R2)3, ((R2)2N)2C=NR2, 0=S(R2)2, substituted or unsubstituted heterocyclyl, or substituted or unsubstituted heteroaryl, and wherein R2 and y are as defined herein. D----(I−−R1)y (I) Further provided are methods of preparing compounds of Formula (I), compositions, reagents, and kits comprising a compound of Formula (I), and methods for fluoroalkylating an organic compound using a compound of Formula (I).
Strongly Reducing, Visible‐Light Organic Photoredox Catalysts as Sustainable Alternatives to Precious Metals
作者:Ya Du、Ryan M. Pearson、Chern‐Hooi Lim、Steven M. Sartor、Matthew D. Ryan、Haishen Yang、Niels H. Damrauer、Garret M. Miyake
DOI:10.1002/chem.201702926
日期:2017.8.16
Photoredox catalysis is a versatile approach for the construction of challenging covalent bonds under mild reaction conditions, commonly using photoredox catalysts (PCs) derived from precious metals. As such, there is need to develop organic analogues as sustainable replacements. Although several organic PCs have been introduced, there remains a lack of strongly reducing, visible-light organic PCs
Mild and selective nickel-catalyzed trifluoromethylation and perfluoroalkylation reactions of alkenes were developed to provide fluorinated olefins, including natural products, pharmaceuticals, and variety of synthetic building blocks in good to excellent yields (38 examples). Control experiments, kinetic measurements and in situ EPR studies reveal the importance of radical species and the formation
Electro[Ni]c: Electronic transfer from a nickel complex bearing redox-active ligands to form radical species is studied. Combined UV/Vis and DFT experiments suggest that the redox-active ligands in the complex sustain this reactivity, and have a greater influence than the metal-based reactivity. This reactivity can be extended to a complex bearing a single “redox-equivalent”.