A RhIII-catalysed ortho C–H amination of phenidones under mild conditions was developed using N-alkyl-O-benzoyl-hydroxylamines as aminating agents, and with a cyclic hydrazine moiety as a directing group, yields of up to 97 % and a high functional group tolerance were observed. This strategy offers an alternative route for the synthesis of amino analogues of the 5-lipoxygenase inhibitor phenidone, and
An HFIP-assisted, cobalt-catalyzed three-component electrophilic C–H amination/cyclization/directing group removal cascade to naphtho[1,2-d]imidazoles
作者:Hasina Mamataj Begam、Kangkan Pradhan、Kasarla Varalaxmi、Ranjan Jana
DOI:10.1039/d3cc00749a
日期:——
A concise and efficient method has been developed herein for the synthesis of valuable naphtho[1,2-d]imidazole derivatives. It involves an earth-abundant cobalt-catalyzed electrophilic ortho C–H amination/cyclization/directing group removal cascade with O-benzoloxyamines using paraformaldehyde as a one carbon synthon. Picolinamide has been utilized as a traceless directing group. A boosting effect