The structures of four isomeric compounds, all C7H4ClNO4.C9H7N, of quinoline with chloro- and nitro-substituted benzoic acid, namely, 2-chloro-5-nitrobenzoic acid-quinoline (1/1), (I), 3-chloro-2-nitrobenzoic acid-quinoline (1/1), (II), 4-chloro-2-nitrobenzoic acid-quinoline (1/1), (III), and 5-chloro-2-nitrobenzoic acid-quinoline (1/1), (IV), have been determined at 185 K.
Condensation of nitrobenzaldehydes 3 and alpha-[o-(p-methoxybenzylthio)benzoyl] sulfoxide 4 gave alpha-sulfinyl enones 5. Treatment of 5 with formic acid caused cyclization followed by debenzylation to afford 3-(methylsulfinyl)thioflavanones 6. Double-bond formation with elimination of methanesulfenic acid was performed by refluxing 6 in
The synthesis and in vitro acetylcholinesterase and butyrylcholinesterase inhibitory activity of tacrine (Cognex?) derivaties.
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