The Using the same method, we synthesized the elongated compounds 3a, 4f-g, 5a-b, characterized by a carbon spacer in the PABA moiety (Schemes 3-4). To obtain 4f-g (Scheme 4), an additional protection step reaction to guide selective amide functionalization was necessary. The selectivity was achieved via Boc-protection in the first step of the reaction of b to obtain 55, which was then coupled with the respective aliphatic amine to give 56-57. The target amines were finally obtained by a deprotection step carried out in 30-40% trifluoroacetic acid/dichloromethane (TFA/DCM) in quantitative yield.