Deaminative Strategy for the Visible-Light-Mediated Generation of Alkyl Radicals
作者:Felix J. R. Klauck、Michael J. James、Frank Glorius
DOI:10.1002/anie.201706896
日期:2017.9.25
A deaminative strategy for the visible‐light‐mediated generation of alkyl radicals from redox‐activated primary amine precursors is described. Abundant and inexpensive primary amine feedstocks, including amino acids, were converted in a single step into redox‐active pyridinium salts and subsequently into alkyl radicals by reaction with an excited‐state photocatalyst. The broad synthetic potential of
2-borylindoles via the copper(I)-catalyzed borylative cyclization of 2-alkenylphenyl isocyanides using diboronate. The reaction proceeds at room temperature under neutral conditions and exhibits high tolerance to functional groups, such as Br, CO2R, COR, CONMe2, and CN. The 2-borylindoles synthesized in the present study can be elaborated into an array of indole-based derivatives, for example, through the
Visible‐Light‐Mediated Charge Transfer Enables C−C Bond Formation with Traceless Acceptor Groups
作者:Michael J. James、Felix Strieth‐Kalthoff、Frederik Sandfort、Felix J. R. Klauck、Felicitas Wagener、Frank Glorius
DOI:10.1002/chem.201901397
日期:2019.6.21
enabled by the photoexcitation of electron donor–acceptor (EDA) complexes with visiblelight. The traceless acceptors, which were readily prepared from amino acid and peptide feedstocks, could be used to alkylate a wide range of heteroarene and enamine donors under metal‐ and peroxide‐free conditions. The crucial role of the EDAcomplexes in the mechanism of these reactions was explored through combined
Functionalized and substituted bis(indolyl)alkanes were synthesized from indoles and dehydroalanine esters in the presence of catalytic amounts of Brønsted acid. When 2- or 4-bulky substituted indoles were used, unusual elimination occurred to yield interesting indolyl acrylates.