摘要：

2, 6-Dimethyl-1-ethoxycarbonylmethylpyridinium bromide (Ia) reacted with ketene-thioacetal derivatives (II) in the presence of potassium carbonate to afford 3-ethoxycarbonylindolizine derivatives (IV) and 3-vinylindolizine derivatives (V). While, 2-aminopyridinium salts (VII) reacted with II in the presence of potassium carbonate only to give 3-vinylimidazo [1, 2-α] pyridine derivatives (VIII). Ia was treated with sodium hydride, carbon disulfide and then dimethyl sulfate to afford methyl 2-hydroxy-5-methylindolizine-3-dithiocarboxylate (XIII). Also, imidazo [1, 2-α] pyridine-3-dithiocarboxylate derivatives (XVIII, XIX) were obtained from VII. Some reactivities of XIII, XVIII and XIX with amines or active methylene compound were described.

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