Abstract
15-Acetyl- and 16-acetylfuranolabdanoids were synthesised by the acetylation of the methyl ester of lambertianic acid with acetic anhydride in the presence of Mg(ClO4)2 and used as starting compounds for the preparation of 15- or 16-(3-aminopropanoyl)methyllambertianates. The proposed approach involved silylation of 15-acetyl- or 16-acetylmethyllambertianate and the Mannich reaction of the resulting enol silyl ester with N,N-disubstituted methyleneiminium salts. The synthesized compounds possessed cytotoxicity on tumour cell lines CCRF CEM, MCF7 and PC-3 (MTT test). The compounds containing a 3-morpholinopropanoyl or 3-pyrrolidinopropanoyl substituent at the C-16 position of methyl lambertianate selectively inhibited the growth of human T-cell leukemia cells (GI50 was 5.8-6.1 μM) and exhibited cytotoxicity an order of magnitude higher than the parent compound lambertianic acid.
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