| Literature DB >> 29451724 |
Maximilian Koy1, Frederik Sandfort1, Adrian Tlahuext-Aca1, Linda Quach1, Constantin G Daniliuc1, Frank Glorius1.
Abstract
The palladium-catalyzed coupling reaction of N-hydroxyphthalimide esters and styrenes to deliver exclusively (E)-substituted olefins under irradiation with visible light is reported. This method tolerates N-hydroxyphthalimide esters derived from primary, secondary, tertiary as well as benzylic carboxylic acids. Notably, Pd(PPh3 )4 is employed as an inexpensive palladium source and no addition of base or classical photocatalyst is required. Mechanistic studies suggest a light-mediated single-electron reduction of the activated acid by a photoexcited palladium(0) species to access alkyl radicals through decarboxylation.Entities:
Keywords: Heck-type coupling; carboxylic acids; decarboxylation; palladium; redox-active esters
Year: 2018 PMID: 29451724 DOI: 10.1002/chem.201800813
Source DB: PubMed Journal: Chemistry ISSN: 0947-6539 Impact factor: 5.236