AbstractMass spectra of fourteen 2‐styryl‐ and 2,5‐distyrylfuran and ‐thiophene derivatives are reported. Each styryl substituent has an α‐carboxylic acid or methyl carboxylate substituent. Although the parent ion is the base peak for the styryl and distyryl derivatives, the distyryl species showed less fragmentation than the styryl species. In addition to simple bond cleavages, loss of formic acid or methyl formate was important in many of the species, presumably forming acetylenic fragments.
Synthesis, antitumor evaluation and DNA binding studies of novel amidino-benzimidazolyl substituted derivatives of furyl-phenyl- and thienyl-phenyl-acrylates, naphthofurans and naphthothiophenes
A series of amidino-substituted benzimidazoles, related to furyl-phenyl- and thienyl-phenyl-acrylates, naphthofurans and naphthothiophenes were prepared, their antitumor evaluation and interactions with ct-DNA have been investigated. All tested compounds show differential and strong antitumor activity without apparent difference depending on their structures. Interestingly, the MCF-7 tumor cell line is highly sensitive to all compounds. Compounds 6-9 showed noticeable selectivity in regard to normal fibroblasts (WI 38). Compounds 4-9 interact with ct-DNA by more binding modes, whose mutual distribution is dependent on the compound/DNA ratio. The "acyclic" 4-6 and "cyclic" compound 7 interact mostly within the minor groove of DNA, although partial intercalation of 6 and 7 cannot be excluded. The "cyclic" compounds 8 and 9 intercalate between DNA base pairs at high excess of DNA over compounds. (C) 2008 Elsevier Masson SAS. All fights reserved.
The Synthesis of New Heteropolycyclic Quinolone by Twofold Photocyclization: Methoxycarbonylnaphtho[2”,1”: 2’,3’-b]thieno[4’,5’: 2,3]thieno[5,4-c]quinolin-6(5H)-one
New heterocyclic ring system namely 12-methoxycarbonylnaphtho[2'',1'':2',3-b]thieno[4',5':2,3]thieno[5,4-c]-quinolin-6(5H)-one (11) is prepared by multistep synthesis introducing twofold photochemical cyclization.