Synthesis and leishmanicidal activity of cinnamic acid esters: structure–activity relationship
摘要:
Several cinnamic acid esters were obtained via Fischer esterification of cinnamic acids derivatives with aliphatic alcohols. Structures of the products were elucidated by spectroscopic analysis. The synthesized compounds were evaluated for antileishmanial activity against L. (V) panamensis amastigotes and cytotoxic activity was evaluated against mammalian U-937 cells. The compounds 11, 15-17, and 23, were active against Leishmania parasite and although toxic for mammalian cells, they still are potential candidates for antileishmanial drug development. A SAR analysis indicates that first, while smaller alkyl chains lead to higher selectivity indices (10, 11 vs. 12-17); second, the degree of oxygenation is essential for activity, primarily in positions 3 and 4 (17 vs. 18-20 and 22); and third, hydroxyl groups increase both activity and cytotoxicity (14 vs. 23). On the other hand, the presence of a double bond in the side chain is crucial for cytotoxicity and leishmanicidal activity (12 vs. 21). However, further studies are required to optimize the structure of the promising molecules and to validate the in vitro activity against Leishmania demonstrated here with in vivo studies.
Synthesis and antioxidant activity of long chain alkyl hydroxycinnamates
作者:Jose C.J.M.D.S. Menezes、Shrivallabh P. Kamat、Jose A.S. Cavaleiro、Alexandra Gaspar、Jorge Garrido、Fernanda Borges
DOI:10.1016/j.ejmech.2010.12.016
日期:2011.2
Longchainalkyl hydroxycinnamates (8–21) were synthesized from the corresponding half esters of malonic acid (5–7) and benzaldehyde derivatives by Knoevenagel condensation. The total antioxidant capacity of these hydroxycinnamyl esters was evaluated using DPPH and ABTS assays. The observed antioxidant activity was highest for esters of caffeic acid followed by sinapic esters and ferulic esters. The