Synthesis of the saturated analogue of Fluxapyroxad was undertaken from carboxylic acid 11b (Scheme 4). The standard Curtius reaction followed by acylation of the intermediate amine with the substituted pyrazole carboxylic acid gave the needed compound 29. Using an analogous tactic, compound 31, -a saturated analogue of Boscalid, -was also obtained from carboxylic acid 17b (Scheme 4). The saturated analogue of Phtalylsulfathiazole was obtained by converting carboxylic acid 16b first into the methyl ester followed by the oxidation of the phenyl ring. Amide coupling of the formed acid with the substituted aniline followed by saponification of the methyl ester gave the final compound 33 (Scheme 4). Amide coupling of carboxylic acid 19b with the correspondingly N-substituted 4-aminopiperidine gave compound 35a saturated analogue of Lopitamide (Scheme 4).