Journal of Heterocyclic Chemistry p. 1345 - 1354 (1996)
Update date:2022-08-03
Topics:
Aulaskari, Paula
Ahlgren, Markku
Rouvinen, Juha
Vainiotalo, Pirjo
Pohjala, Esko
Vepsaelaeinen, Jouko
1-R-5-[(2-Nitro-2-phenyl)ethenyl]imidazoles (R = Bn, Me, H) 6a,b,c were synthesized by the Knoevenagel reaction of the corresponding aldehydes 4a,b,c with phenylnitromethane 5. The E-isomers 6a,b,c were precipitated from the reaction mixture as crystalline compounds in 89, 81 and 60% yields, respectively. Traces of the Z-isomers 6a'b',c' were found in the reaction mixtures but could be obtained in a ratio of 4:3 from the E-form with UV irradiation. The E-forms were more stable and the Z-isomers changed again to the E-isomers in several weeks.
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