cobalt catalysts at 30 °C. The results of 18O-labeling experiments suggested that rearrangement of the alkoxycarbonyl group from the aniline nitrogen to the ortho position proceeded in an unprecedented [1,3] manner.
reported previously, our mechanistic studies including oxygen-18 labelling experiments indicate that the rearrangement of the alkoxycarbonyloxy group proceeds in [1,3]-manner. In this article, we discuss the overall picture of the cobalt-catalysed [1,3]-rearrangement reaction including details of the reaction conditions and substrate scope.
The present invention is a chemical compound of formula (I)
or a pharmaceutically acceptable salt, solvate and ester thereof, wherein R1 to R4 and n are as defined in the specification. A compound of formula 1 is useful as a pharmaceutical composition for the treatment or prevention of disorders of the central nervous system, cardiovascular disorders, gastrointestinal disorders, diabetes, obesity and sleep apnoea.