Concise Synthesis of Potassium Acyltrifluoroborates from Aldehydes through Copper(I)‐Catalyzed Borylation/Oxidation
作者:Jumpei Taguchi、Takumi Takeuchi、Rina Takahashi、Fabio Masero、Hajime Ito
DOI:10.1002/anie.201901748
日期:2019.5.27
subsequent oxidation. This synthetic route is characterized by the wide range of aldehydes accessible, favorable step economy, mild reaction conditions, and tolerance of various functionalgroups, and it enables the facile generation of a range of KATs, for example, bearing halide, sulfide, acetal, or ester moieties. Moreover, this method was applied to the three‐step synthesis of various α‐aminoacid analogues
Photoredox Generation of Carbon-Centered Radicals Enables the Construction of 1,1-Difluoroalkene Carbonyl Mimics
作者:Simon B. Lang、Rebecca J. Wiles、Christopher B. Kelly、Gary A. Molander
DOI:10.1002/anie.201709487
日期:2017.11.20
facile, scalable route to access functional‐group‐rich gem‐difluoroalkenes. Using visible‐light‐activated catalysts in conjunction with an arsenal of carbon‐radical precursors, an array of trifluoromethyl‐substituted alkenes undergoes radical defluorinative alkylation. Nonstabilized primary, secondary, and tertiary radicals can be used to install functional groups in a convergent manner, which would otherwise
Direct Synthesis of Secondary Benzylic Alcohols Enabled by Photoredox/Ni Dual-Catalyzed Cross-Coupling
作者:Rauful Alam、Gary A. Molander
DOI:10.1021/acs.joc.7b02589
日期:2017.12.15
An operationally simple, mild, redox-neutral method for the cross-coupling of alpha-hydroxyalkyltrifluoroborates is reported. Utilizing an Ir photocatalyst, alpha-hydroxyalkyl radicals are generated from the single-electron oxidation of the trifluoroborates, and these radicals are subsequently engaged in a nickel-catalyzed C-C bond-forming reaction with aryl halides. The process is highly selective, functional group tolerant, and step economical, which allows the direct synthesis of secondary benzylic alcohol motifs.