Abstract
Addition of amines to α-(2-furyl)-β-(5-nitro-2-furyl) ethynyl (I) gave N-substituted α-(2-furyl)-β-(5-nitro-2-furyl) vinylamines. Bromination of I gave stereoisomers which were identified as E- and Z-forms, judging from their ultraviolet absorption spectra. The reaction of I with N-substituted pyridinium ylides was not uniform. Only the common indolizines, namely 3-substituted 1-(5-nitro-2-furyl)-2-(2-furyl) indolizines, were obtained by reaction in dioxane, whereas 3-substituted 1-(4-alkylated 5-nitro-2-furyl)-2-(2-furyl)-indolizines were isolated by reaction in dimethylformamide, together with the common indolizines.
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