Dedicated to Professor Hisashi Yamamoto for his 80th birthday.
Abstract
The transformation of cyclobutanones into acyclic carbonyl compounds through a Pd-catalyzed C–C bond cleavage is reported. The use of an N-heterocyclic carbene ligand efficiently promoted the ring opening and functionalization of various cyclobutanones, not only with alcohols, but also with N-centered nucleophiles, such as aniline or amide derivatives. Cyclobutanones were also found to react with arylboronic esters, resulting in the production of acyclic aryl ketones.
Key words
palladium catalysis - N-heterocyclic carbenes - cyclobutanones - C–C bond activation - ring opening - arylboronate esters