salts has rendered the products easily isolable, which greatly improved the synthetic practicality of the monodefluoroborylation reaction. Stoichiometric experiments indicate that the fate of the regioselectivity depends on the mode of β-fluorine elimination, which depends on the substrate. Further transformation of the boryl group has allowed facile preparation of fluoroalkene derivatives as exemplified
Visible-light-promoted<i>E</i>-selective synthesis of α-fluoro-β-arylalkenyl sulfides<i>via</i>the deoxygenation/isomerization process
作者:Yuxiu Li、Xiangqian Li、Xiaowei Li、Dayong Shi
DOI:10.1039/d0cc08254f
日期:——
Regioselective synthesis of α-fluoro-β-arylalkenyl sulfides has been established with gem-difluoroalkenes and sodium sulfinates in a transition-metal-free manner. A series of control experiments were executed to demonstrate thiol radicals and anions as the proposed intermediates. Notably, regioselective Z → E isomerization was achieved under green light irradiation in the absence of a photoinitiator
Direct Vinylation and Difluorovinylation of Arylboronic Acids Using Vinyl- and 2,2-Difluorovinyl Tosylates via the Suzuki−Miyaura Cross Coupling
作者:Thomas M. Gøgsig、Lina S. Søbjerg、Anders T. Lindhardt、Kim L. Jensen、Troels Skrydstrup
DOI:10.1021/jo7027097
日期:2008.5.1
reaction conditions were developed for the Pd(0)-catalyzed Suzuki−Miyaura coupling reaction of aryl boronic acids with a simple electrophilic vinylation reagent, vinyl tosylate, providing access to styrene derivatives in good yields. The easilyaccessible vinyl tosylate represents a stable and less toxic alternative to the vinyl halides and the triflate/nonaflate derivatives. Furthermore, this methodology
we present a strategy for the formation of 2‐fluoro‐1,3‐diene derivatives via rhodium‐catalyzed direct C(sp2)—C(sp2) cross‐coupling of gem‐difluoroalkenes and acrylamides. By merging Rh(III)‐catalyzed C(sp2)–H bond activation and nucleophilic addition/F‐elimination of gem‐difluoroalkene, an efficient defluorinative vinylation reaction is uncovered, which leads to the generation of 2‐fluoro‐1,3‐dienes
Radical Hydroboration and Hydrosilylation of <i>gem</i>-Difluoroalkenes: Synthesis of α-Difluorinated Alkylborons and Alkylsilanes
作者:Xiaozu Liu、E Emily Lin、Guojun Chen、Ji-Lin Li、Peijun Liu、Honggen Wang
DOI:10.1021/acs.orglett.9b03218
日期:2019.10.18
This protocol features good functional group tolerance, operational simplicity, high atom economy, and easy scale-up, enabling efficient assembly of a wide range of α-difluorinated alkylborons and alkylsilanes in moderate to excellent yields. The synthetic utility of these products is demonstrated by further transformation of the C–B bond and C–Si bond into valuable CF2-containing molecules.