<i>gem</i>
‐Difluoroallylation of Aryl Halides and Pseudo Halides with Difluoroallylboron Reagents in High Regioselectivity
作者:Shu Sakamoto、Trevor W. Butcher、Jonathan L. Yang、John F. Hartwig
DOI:10.1002/anie.202111476
日期:2021.12
coupling of a difluoroallylboronate with aryl and heteroaryl halides and triflates provides a convenient and broadly applicable synthesis of difluoroallylarenes. The difluoroallyl boron reagent is formed by a copper-catalyzed defluorinative borylation of the inexpensive reagent 3,3,3-trifluoropropene, and the products undergo a wide range of reactions to a series of difluoro-substituted analogs of common
Palladium-Catalyzed Diversified Synthesis of Monofluorinated Alkenes from Allylic <i>gem</i>-Difluorides through Pd–OH Intermediate
作者:Lu-ning Tang、Guo-ying Liu、Jun-hua Li、Ming Chen
DOI:10.1021/acs.orglett.3c03917
日期:2023.12.22
synthesis of monofluoroalkenes via palladium-catalyzed reactions involving allylic gem-difluorides and diverse nucleophiles have been achieved. This method allows regioselective arylation, alkylation, allylation, alkenylation, and hydrogenation of allylic gem-difluorides, yielding high Z-selectivity and favorable product yields under mild conditions. Tolerating various functional groups, these transformations
Herein, a palladium-catalyzed regioselective alkynylation, esterification, and amination of allylic gem-difluorides via C–F bond activation/transmetallation/β-C elimination or nucleophilic attack has been achieved. This innovative protocol showcases an extensive substrate range and operates efficiently under mild reaction conditions, resulting in high product yields and Z-selectivity. Particularly
electrophilic fluoroalkylating reagents, 3,3-difluoroallyl sulfonium salts (DFASs), and organometallic reagents, including Grignard and organozinc reagents, has been developed. In this strategy, a stepwise procedure by nucleophilic addition of organometallic reagents to TCP, followed by copper-catalyzed cross-coupling with DFASs, favors the formation of fluoroalkylated BCPs. A one-pot copper-catalyzed three-component