The 3-step synthesis of furylpyridines is described, using ethyl pyridinoylacetates as starting materials for 2-furyl compounds and chloroacetylpyridines for 3-furyl isomers. Furthermore, these last compounds were prepared by a convenient new method for 3-substituted furan synthesis. This synthesis starts from bromopyridines and proceeds through the key intermediates (2,2-diethoxyacetyl)pyridines and methyl 2-(x-pyridyl)-4,4-diethoxy-2-methoxy-2-butenoates. The physical properties of the furylpyridines have been determined. Structures and interactions between furan and pyridine rings have been discussed by comparing their uv spectra, basicity constants, and dipole moments with those of phenyl and thienylpyridines.
描述了
呋喃吡啶的三步合成方法,使用乙基
吡啉酰
乙酸酯作为2-
呋喃化合物的起始物质,
氯乙酰
吡啶作为3-
呋喃异构体的起始物质。此外,这些最后的化合物是通过一种方便的新方法制备的,用于3-取代
呋喃的合成。这种合成从
溴吡啶开始,通过关键
中间体(
2,2-二乙
氧基乙酰)
吡啶和
甲基2-(x-
吡啶基)-4,4-二乙
氧基-
2-甲氧基-
2-丁烯酸
酯进行。已确定了
呋喃吡啶的物理性质。通过比较它们的紫外光谱、碱度常数和偶极矩与
苯基和
噻吩基
吡啶的相同性质,讨论了
呋喃和
吡啶环之间的结构和相互作用。