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Synthesis of Esters of 6-(2,5-Dioxopyrrolidin-1-yl)-2-(2-oxoazepan-1-yl)hexanoic Acid as Potential Transdermal Penetration Enhancers
1 , 1, 2 , 2 , 1 , * 1
1  Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences, Palackeho 1/3, 61242 Brno, Czech Republic.
2  Zentiva a.s., U kabelovny 130, 102 37 Prague 10, Czech Republic

Abstract: Skin penetration enhancers are used in the formulation of transdermal delivery systems for drugs that are otherwise not sufficiently skin-permeable. The series of seven esters of 6-(2,5-dioxopyrrolidin-1-yl)-2-(2-oxoazepan-1-yl hexanoic acid as potential transdermal penetration enhancers was formed by multistep synthesis. The general synthetic approach of all newly synthesized compounds is presented. Structure confirmation of all generated compounds was accomplished by IR, 1H, 13C NMR and HR-MS spectroscopy. All the prepared compounds were analyzed using RP-HPLC method for the lipophilicity measurement and their lipophilicity (log k) was determined.
Keywords: Transdermal penetration enhancers; 6-Aminohexanoic acid derivatives