Investigating the activity of 2-substituted alkyl-6-(2,5-dioxopyrrolidin-1-yl)hexanoates as skin penetration enhancers

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• 作者：Katerina Brychtova ; Radka Opatrilova ; Ivan Raich ; Danuta S. Kalinowski ; Lenka Dvorakova ; Lukas Placek ; Jozef Csollei ; Des R. Richardson ; Josef Jampilek
• 关键词：ω ; -Lactam derivatives ; 6-Aminohexanoic acid derivatives ; Lipophilicity ; Ab initio calculations ; Molecular dynamic simulations ; 3D structures ; Transdermal penetration enhancers ; Anti-proliferative activity
• 刊名：Bioorganic and Medicinal Chemistry
• 出版年：2010
• 出版时间：15 December 2010
• 年：2010
• 卷：18
• 期：24
• 页码：8556-8565
• 全文大小：869 K

文摘

Skin penetration enhancers are used in the formulation of transdermal delivery systems for drugs that are otherwise not sufficiently skin-permeable. We generated two series of esters by multi-step synthesis with substituted 6-aminohexanoic acid as potential transdermal penetration enhancers by multi-step synthesis. The synthesis of all newly prepared compounds is presented here. Structure confirmation of all generated compounds was accomplished by ¹H NMR, ¹³C NMR, IR and MS spectroscopy. All the prepared compounds were analyzed using RP-HPLC and their lipophilicity (log k) was determined. The hydrophobicity (log P/C log P) of the studied compounds was also calculated using two commercially available programs and 3D structures of the selected compounds were investigated by means of ab initio calculations of geometry and molecular dynamic simulations. All the synthesized esters were tested for their in vitro transdermal penetration-enhancing activity and showed higher enhancement ratios than oleic acid. The highest enhancement ratios were exhibited by compound 5f (C₍₂₎ substituted with piperidine-2-one, C₁₁ ester chain) and 5a (C₍₂₎ substituted with piperidine-2-one, C₆ ester chain). The series with a ω-lactam ring (piperidin-2-one; 5a–g), showed slightly higher activities than those with morpholine (6a–6g). All of the agents showed minimal anti-proliferative activity (IC₅₀ >6.25 μM), indicating they would have low cytotoxicity when administered as chemical penetration enhancers. The relationships between the lipophilicity and the chemical structure of the studied compounds, as well as the correlation between their chemical structure and transdermal penetration-enhancing activity, are discussed.