Synthesis of the 3-methyl and 4-methyl derivatives of 3-amino-3,4-dihydro-1-hydroxycarbostyril and related compounds
作者:Alvie L. Davis、David L. Tabb、Janet K. Swan、Tommy J. Mccord
DOI:10.1002/jhet.5570170711
日期:1980.11
α-amino-β-(o-aminophenyl)butyric acid which were converted to the corresponding lactams, 3-methyl- and 4-methyl-3-amino-3,4-dihydrocarbostyrils. α-Methyl-β-(o-nitrophenyl)alanine was obtained by acid hydrolysis of 5-methy)-5-(o-nitrobenzyl)hydantoin which was prepared by treatment of o-nitrophenylacetone with potassium cyanide and ammonium carbonate. α-Amino-β-(o-nitrophenyl)butyric acid was synthesized by
通过对α-甲基-β-(邻硝基苯基)丙氨酸和α-氨基-β-(邻硝基苯基)丁酸氢卤化物,分别在酸性溶液中催化氢化的条件下。后两个邻硝基芳香族氨基酸的游离碱也在中性条件下催化氢化,分别得到α-甲基-β-(邻氨基苯基)丙氨酸和α-氨基-β-(邻氨基苯基)丁酸,它们将其转化为相应的内酰胺,3-甲基-和4-甲基-3-氨基-3,4-二氢咔唑。α-甲基-β-(o通过对5-甲基)-5-(邻硝基苄基)乙内酰脲进行酸水解而获得-硝基苯基)丙氨酸,该乙醛是通过用氰化钾和碳酸铵处理邻硝基苯丙酮而制备的。通过将α-溴-邻-硝基乙基苯与乙酰氨基丙二酸二乙酯缩合,然后酸水解该缩合产物,来合成α-氨基-β-(邻-硝基苯基)丁酸。获得的4-甲基化化合物是两种非对映体外消旋体的合成混合物,其含量与nmr光谱分析显示的几乎相同。与去甲基化的母体化合物3-氨基-3,4-二氢-1-羟基卡斯蒂替利不同,3-甲基和4-甲基类似物均未发现具有任何抗菌活性。