Effect of substituents in the propynyl fragment and at the nitrogen atom on the intramolecular cyclization of (3-aryl-2-propynyl)-(4-hydroxy- 2-butynyl)ammonium chlorides and also on the recyclization of the products formed
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Cyclization of dialkyl(4-hydroxy-2-butynyl)[3-(α-naphthyl)-2-propynyl]ammonium chlorides using aqueous KOH solution occurs under more rigorous conditions (1:1 ratio of salt to base) than in the case of their 3-phenyl(p-chlorophenyl, alkenyl)-substituted analogs (5:1 ratio of salt to KOH). Similarly, more rigorous conditions are also needed for the cyclization of (4-hydroxy-2-butynyl)-(3-phenyl-2-propynyl)piperazinium- and dicyclohexylammonium chlorides. In addition to the cyclization products - corresponding dialkyl(7-hydroxymethyl)naphtho[1,2-f]isoindolinium or dialkyl-(4-hydroxy-methyl)benzo[f]isoindolinium chlorides, the products of recyclization of these – dialkyl-amino-phenanthro[1,2-c]furan or dialkylaminonaphtho[1,2-c]furan are also formed. The indicated derivatives become the main products of conversion of the starting salts by a change of salt to KOH ratio, 1:2, and with an increase in the time of the reaction. The results obtained can be explained by steric effect and also the lower thermal stability of the obtained naphtho[1,2-f]isoindolinium salt system compared to the analogous benzo[f]isoindolinium systems.
Keywords4-(dialkylaminomethyl)-1,3-dihydrophenanthro[1,2-c]furans 4-(dicyclohexylaminomethyl)-1,3-dihydronaphtho[1,2-c]furan 1-(1,3-dihydronaphtho[1,2-c]furan-4-ylmethyl)-4-(p-fluorophenyl)pipera-zine dialkyl(4-hydroxy-2-butynyl)[3-(α-naphthyl)-2-propynyl]ammonium chlorides intramolecular cycli-zation and recyclization in the presence of base.
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