Anti-Markovnikov Hydroarylation of Unactivated Olefins via Pyridyl Radical Intermediates
作者:Allyson J. Boyington、Martin-Louis Y. Riu、Nathan T. Jui
DOI:10.1021/jacs.7b03262
日期:2017.5.17
The intermolecular alkylation of pyridine units with simple alkenes has been achieved via a photoredox radical mechanism. This process occurs with complete regiocontrol, where single-electron reduction of halogenated pyridines regiospecifically yields the corresponding radicals in a programmed fashion, and radical addition to alkene substrates occurs with exclusive anti-Markovnikov selectivity. This
Highly Regioselective α-Addition of Alkynyl and Alkenyl Grignard Reagents to 1-Alkoxycarbonylpyridinium Salts and Its Application to Synthesis of 1-Azabicycloalkanes and (±)-Solenopsin A
Nucleophilic addition of a variety of alkynyl and alkenyl Grignardreagents to 1-methoxycarbonylpyridinium chloride takes place at the α-position in a highly regioselective manner to give 2-substituted 1-methoxycarbonyl-1,2-dihydropyridines exclusively, while, with alkyl Grignardreagents, a lack of the regioselectivity is observed. These results may be explained by the HSAB principle. The high α-regioselectivity