Nitrate promoted mild and versatile Pd-catalysed C(sp2)-H oxidation with carboxylic acids
A nitrate-promoted Pd-catalysed mild cross-dehydrogenative C(sp2)-H bond oxidation of oximes or azobenzenes with diverse carboxylic acids has been developed. In contrast to the previous catalytic systems, this protocol features mild conditions (close to room temperature for most cases) and a broad substrate scope (up to 64 examples), thus constituting a versatile method to directly prepare diverse O-aryl esters. Moreover, the superiority of the nitrate additive in this mild transformation was further determined by experimental and computational evidence.
Ruthenium-Catalyzed Regioselective Direct Ortho-Acyloxylation of Azoarenes with Carboxylic Acids via C–H Bond Activation
A RuII-catalyzed highly regioselective C–H acyloxylation of azoarenes with inexpensive alkyl and aryl carboxylic acids as an acyloxylation agent is described. The reaction demonstrates a broad substrate scope and good functional group tolerance
Kianmehr, Ebrahim,Nasab, Sepideh Bahrami
p. 1038 - 1044
(2019/01/25)
Palladium-catalyzed ortho-functionalization of azoarenes with aryl acylperoxides
With the aid of an azo directing group, Pd-catalyzed ortho-sp2 C-H bond activation/functionalization of azoarenes with aryl acyl peroxides has been explored. This transformation provides easy access to regioselectively introducing acyloxyl and aryl groups into azoarenes by simply changing the reaction temperature and solvent. This journal is the Partner Organisations 2014.