Sulfonamides of primary amines bearing an aromatic ring at the gamma-position were treated with (diacyloxyiodo)arenes and:iodine under irradiation conditions with;a tungsten-lamp to give the corresponding 1,2,3,4-tetrahydroquinoline derivatives in moderate to good yields. Here, the reactivity depends on the Z-group (protecting group) of the starting amides. Under the same reaction conditions, some sulfonamides were treated with (diacetoxyiodo)benzene and iodine in the presence of aromatics to give the corresponding N-arylated amides. These reactions proceed through the intramolecular and intermolecular amidations onto aromatic rings via the sulfonamidyl radicals formed.
AN INTRAMOLECULAR AMINATION OF ARYL HALIDES WITH A COMBINATION OF COPPER (I) IODIDE AND CESIUM ACETATE: PREPARATION OF 5,6-DIMETHOXYINDOLE-1,2-DICARBOXYLIC ACID 1-BENZYL ESTER 2-METHYL ESTER