申请人:Merck & Co., Inc.
公开号:US03993656A1
公开(公告)日:1976-11-23
There is described 1,8-naphthyridin-2(1H)-one compounds with bronchodilating and hypotensive properties prepared by reaction of 2,6-diaminopyridine with an appropriate .beta.-diketone providing a 2-aminonaphthyridine compound which upon treatment with nitrous acid is converted to the 2-oxo product. Alternatively, an appropriate .beta.-diketone can be reacted with an alkyl alkoxycarbonylacetimidate, the alkyl 2-aminonicotinate thus formed converted to the hydrazide, which upon treatment with a sulfonyl halide forms the N-sulfonyl hydrazide derivative. This intermediate is reacted with an alkali metal carbonate to provide the 2-aminonicotinaldehyde which upon reaction with an ester of a substituted aliphatic carboxylic acid provides the desired product. In some cases the aminonicotinaldehyde is generated in situ in the presence of the ester thereby giving the desired product in one step from the N-sulfonyl hydrazide derivative.
描述了具有支气管扩张和降压特性的1,8-萘啶-2(1H)-酮化合物,通过将2,6-二氨基吡啶与适当的β-二酮反应制备,提供了一种2-氨基萘啶化合物,该化合物在与亚硝酸处理后转化为2-酮产物。或者,适当的β-二酮可以与烷基烷氧羰基乙酰亚胺反应,从而形成烷基2-氨基烟酸酯,将其转化为酰肼,然后经过与磺酰卤反应形成N-磺酰酰肼衍生物。将这种中间体与碱金属碳酸盐反应,提供2-氨基烟酸醛,再通过与取代脂肪族羧酸酯反应,提供所需的产物。在某些情况下,氨基烟酸醛在酯的存在下原位生成,从而从N-磺酰酰肼衍生物中一步得到所需的产物。