Herein, we report an effective method to offer chiral gem-difluorinated cyclopropanes containing an all-carbonquaternarystereocenter by rhodium-catalyzed stereoablative kinetic resolution. The activation of a sterically hindered all-carbonquaternary C–C bond through oxidative addition with a chiral rhodium complex is proposed as the enantiodetermining step. A wide range of gem-difluorinated cyclopropanes
Herein, we report an electrocatalytic hydrofluorination of aryl-substituted alkenes with a nucleophilic fluorine source. The merger of palladium catalysis with electrooxidation enables the transformation of various substrates ranging from styrenes to more challenging α,β-unsaturated carbonyl derivatives to the corresponding benzylic fluorides. This method can also be applied to the late-stage modification
A new electrochemical strategy for the atom transfer radicaladdition (ATRA) of polychloroalkanes across olefins has been realized by the synergism of paired electrolysis and halogen bonding activation. Notably, readily accessible 4,4-di-tert-butyl bipyridine (dtbpy), acting as a halogen bonding acceptor, shifted the reduction potential of C—Cl bonds positively by 110 mV. The decreased operating potential
An unprecedented approach to isoxazoline aldoximes via the reactions of nitromethane and olefins is achieved. Nitromethane is electrochemically activated to serve as both the heterocyclic skeleton and oxime sources for the construction of isoxazoline aldoximes.
Rhodium‐Catalyzed Regio‐ and Diastereoselective [3+2] Cycloaddition of <i>gem</i>‐Difluorinated Cyclopropanes with Internal Olefins
作者:Yaxin Zeng、Ying Xia
DOI:10.1002/anie.202307129
日期:2023.8.7
A rhodium-catalyzed [3+2] cycloaddition reaction between readily available gem-difluorinated cyclopropanes and internal olefins has been developed, providing a wide range of multisubstituted gem-difluorinated cyclopentanes. This reaction shows an example where the “CF2” motif can be kept upon ring extension. The process is atom-economic and allows to reach numerous gem-difluorinated cyclopentanes with