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.
描述了一种具有支气管扩张和降压作用的
1,8-萘啶并[2,1-h]
嘧啶-2(1H)-酮化合物,由2,6-二
氨基吡啶与适当的
β-二酮反应制备出2-
氨基
萘啶化合物,该化合物在
硝酸处理下转化为2-氧代产物。或者,适当的
β-二酮可以与烷基烷氧羰基乙酰胺反应,形成烷基
2-氨基烟酸盐,然后转化为
肼酸酯,该
肼酸酯在与磺
酰卤素处理后形成N-磺酰
肼酸酯衍
生物。将该中间体与碱
金属
碳酸盐反应,提供2-
氨基
烟醛,该
烟醛在与取代
脂肪酸酯的酯反应中提供所需的产物。在某些情况下,
氨基
烟醛在酯的存在下原位生成,从而在一步反应中从N-磺酰
肼酸酯衍
生物中得到所需的产物。