Condensation of N-(piperidylidene-4)arylamines with acetylenedicarboxylic esters

The substituted piperidines, N-(piperidin-3-en-4-yl)-N-(1,2-dimethoxycarbonyl-etheno)arylamine and 1-aryl-3,4,5,6-tetramethoxycarbonyl-1,2-dihydrospiro[cyclo-[pyridine-2,4′-piperidine], were synthesized by the condensation of acetylenedicarboxylic ester with an azomethine, obtained from a γ-piperidone. It was found that the amounts of 1:1 and 1:2 addition compounds obtained depends on the ratio of starting reagents. Compounds isomeric at the vinyl group were examined in the case of one of the 1:1 addition compounds. N-(1,2,5-trimethylpiperidin-4-yl)-N-(1,2-dimethoxycarbonyletheno)aniline was prepared by two methods. © 1987 Plenum Publishing Corporation

Condensation of N-(piperidylidene-4)arylamines with acetylenedicarboxylic esters

The substituted piperidines, N-(piperidin-3-en-4-yl)-N-(1,2-dimethoxycarbonyl-etheno)arylamine and 1-aryl-3,4,5,6-tetramethoxycarbonyl-1,2-dihydrospiro[cyclo-[pyridine-2,4′-piperidine], were synthesized by the condensation of acetylenedicarboxylic ester with an azomethine, obtained from a γ-piperidone. It was found that the amounts of 1:1 and 1:2 addition compounds obtained depends on the ratio of starting reagents. Compounds isomeric at the vinyl group were examined in the case of one of the 1:1 addition compounds. N-(1,2,5-trimethylpiperidin-4-yl)-N-(1,2-dimethoxycarbonyletheno)aniline was prepared by two methods. © 1987 Plenum Publishing Corporation

1-(FLUOREN-2-YL)-2-(2-AZAFLUOREN-3-YL) ETHENE AND 1-(FLUOREN-2-YL)-2-(2H,2-METHYLINDENO[2,3-C]PYRIDINE)ETHENE

Condensation of 3-methyl-2-azafluorene with 2-formylfluorene results in the formation of a compound containing a polyconjugated system and two acidic CH centers, namely, 1-(fluoren-2-yl)-2-(2-azafluoren-3-yl)ethene. The conversions of this compound upon treatment with alkali have been studied by electronic absorption spectroscopy. The methyl iodide derivative of this base was used as an intermediate in the preparation of a pseudo-azulene, 1-(fluoren-2-yl)-2-(2H, 2-methylindeno[2,3-c]pyridine)ethene. © 1987 Plenum Publishing Corporation

1-(Fluoren-2-yl)-2-(2-azafluoren-3-yl)ethene and 1-(fluoren-2-yl)-2-(2H,2-methylindeno[2,3-c]pyridine)ethene

Condensation of 3-methyl-2-azafluorene with 2-formylfluorene results in the formation of a compound containing a polyconjugated system and two acidic CH centers, namely, 1-(fluoren-2-yl)-2-(2-azafluoren-3-yl)ethene. The conversions of this compound upon treatment with alkali have been studied by electronic absorption spectroscopy. The methyl iodide derivative of this base was used as an intermediate in the preparation of a pseudo-azulene, 1-(fluoren-2-yl)-2-(2H, 2-methylindeno[2,3-c]pyridine)ethene. © 1987 Plenum Publishing Corporation

Arylidenehydrazono-2(4)-azafluorenes

Previously unknown unsymmetrical azines with arylidene and azafluorenylidene fragments were obtained. Some of the geometric isomers of 3-methyl-9-benzyl-idene(4-methoxybenzylidene)hydrazono-2-azafluorenes were isolated. The longwave absorption bands in the electronic spectra of these compounds were interpreted on the basis of the experimental and calculated data (the PPP method). © 1986 Plenum Publishing Corporation

1-(Fluoren-2-yl)-2-(2-azafluoren-3-yl)ethene and 1-(fluoren-2-yl)-2-(2H,2-methylindeno[2,3-c]pyridine)ethene

Condensation of 3-methyl-2-azafluorene with 2-formylfluorene results in the formation of a compound containing a polyconjugated system and two acidic CH centers, namely, 1-(fluoren-2-yl)-2-(2-azafluoren-3-yl)ethene. The conversions of this compound upon treatment with alkali have been studied by electronic absorption spectroscopy. The methyl iodide derivative of this base was used as an intermediate in the preparation of a pseudo-azulene, 1-(fluoren-2-yl)-2-(2H, 2-methylindeno[2,3-c]pyridine)ethene. © 1987 Plenum Publishing Corporation