Synthesis and Biological Activity of 4-Amino-5-chloro-2-ethoxy-3-hydroxybenzamides, Metabolites of a New Gastroprokinetic Agent, Mosapride.
作者:Shiro KATO、Toshiya MORIE、Naoyuki YOSHIDA
DOI:10.1248/cpb.44.1484
日期:——
To confirm the proposed structures of the minor metabolites of a potential gastroprokinetic agent, mosapride, 4-amino-5-chloro-2-ethoxy-3-hydroxy-N-(2-morpholinylmethyl)benzamide (3) and the N-(5-oxo-2-morpholinyl)-methyl analogue 4 were prepared. As the common intermediate, 2-ethoxy-3-hydroxy-4-nitrobenzoic acid (15) was propared via the regioselective ethylation of 2, 3-dihydroxybenzaldehyde (10) and subsequent nitration of the resultant 2-ethoxy-3-hydroxybenzaldehyde (11). The key intermediate 15 was converted into the benzamides 3 and 4. After enzymatic treatment of the isolated metabolites, their structures were identified by comparison with the synthetic compounds. Serotonin-4 receptor binding affinity of these metabolites was found to be lower than that of mosapride.
为了确认潜在胃动力药物莫沙普利的小分子代谢产物的提议结构,合成了4-amino-5-chloro-2-ethoxy-3-hydroxy-N-(2-morpholinylmethyl)benzamide (3)和N-(5-oxo-2-morpholinyl)-methyl类似物4。作为共同中间体,通过对2,3-二羟基苯甲醛 (10) 进行区域选择性的乙基化以及对生成的2-乙氧基-3-羟基苯甲醛 (11) 进行后续硝化,合成了2-乙氧基-3-羟基-4-硝基苯甲酸 (15)。关键中间体15转化为苯酰胺3和4。在对分离代谢产物进行酶促处理后,通过与合成化合物的比较确认了它们的结构。这些代谢产物的5-羟色胺4受体结合亲和力低于莫沙普利。