A novel approach to oxoisoaporphine alkaloids via regioselective metalation of alkoxy isoquinolines
作者:Benedikt C Melzer、Franz Bracher
DOI:10.3762/bjoc.13.156
日期:——
cross-coupling of the resulting 1-iodoisoquinolines to methyl 2-(isoquinolin-1-yl)benzoates and intramolecular acylation of the corresponding carboxylic acids with Eaton's reagent afforded five alkaloids of the oxoisoaporphine type. The yield of the cyclization step strongly depends on the electrophilic properties of ring B. An alternative cyclization protocol via directed remote metalation of ester and amide