Abstract
1-Alkyl-1′-N-meta-(ferrocenyl) benzoyl dipeptide esters 7–18 and 1-alkyl-1′-N-ortho-(ferrocenyl) benzoyl dipeptide esters 19–30 were prepared by coupling the alkyl ferrocenyl benzoic acids 1–6 to the dipeptide ethyl esters Gly-Gly(OEt), Gly-L-Ala(OEt), Gly-L-Leu(OEt) and Gly-L-Phe(OEt) using the standard N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDC), 1-hydroxybenzotriazole (HOBt) protocol. The alkyl groups employed in the synthesis were methyl, ethyl and propyl. The compounds were characterized using a combination of 1H NMR, 13C NMR, DEPT-135 and 1H-13C COSY (HMQC) spectroscopy and electrospray ionization mass spectrometry (ESI-MS). Selected compounds showed micromolar activity in the H1299 NSCLC cell line, with IC50 values in the range of 2.6–20.1 μM.
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