Frozen aryldiazonium chlorides in radical reactions with alkenes and arenes
作者:Daniel Thon、Michael C.D. Fürst、Lisa-Marie Altmann、Markus R. Heinrich
DOI:10.1016/j.tet.2018.05.089
日期:2018.9
Frozen aryldiazonium chlorides have been investigated in radical alkene and arene functionalizations. Through freezing at – 84 °C, aryldiazonium chlorides, which otherwise show significant decomposition in aqueous solution after several hours at room temperature, can be stored for at least 20 days. In addition, the slow melting of aryldiazonium-containing ice cubes can serve as an alternative to syringe
Visible-Light-Induced, Catalyst-Free Radical Arylations of Arenes and Heteroarenes with Aryldiazonium Salts
作者:Michael C. D. Fürst、Eva Gans、Michael J. Böck、Markus R. Heinrich
DOI:10.1002/chem.201703954
日期:2017.11.2
photocatalyst and other additives, the radical arylation of diverse arenes and heteroarenes has been achieved with aryldiazonium salts under visible‐light irradiation from a blue light‐emitting diode (LED). Although the course of some reactions can be rationalized by the formation of strongly light‐absorbing charge‐transfer (CT) complexes between the diazonium ion and the aromatic substrate, several
Regioselective Radical Arylation of 3-Hydroxypyridines
作者:Michael C. D. Fürst、Leonard R. Bock、Markus R. Heinrich
DOI:10.1021/acs.joc.6b00894
日期:2016.7.1
The titanium(III)-mediated radical arylation of 3-hydroxypyridines was found to proceed with high regioselectivity for the 2-position. Using aryldiazonium chlorides, which were prepared from the corresponding anilines, as aryl radical sources, a range of 3-hydroxy-2-phenylpyridines were obtained in moderate to good yields under simple reaction conditions. Reactions of ortho-carboxylic ester substituted
作者:Lisa-Marie Altmann、Michael C. D. Fürst、Eva I. Gans、Viviane Zantop、Gerald Pratsch、Markus R. Heinrich
DOI:10.1021/acs.orglett.9b04237
日期:2020.1.17
Aryl radicals generated in the aqueous phase of biphasic mixtures have-regardless of a comparably low polarity- a strong preference to react with aromatic substrates in the aqueous phase and not to undergo phase-transfer into a lipophilic phase, independent from the presence of a surfactant. These results represent an important prerequisite toward future studies in biological systems, which typically