An improved synthesis of 1,3-dihydro-1-methyl-5-phenyl-2<i>H</i>-pyrido[3,4-<i>e</i>]-1,4-diazepin-2-one via <i>ortho</i>-directed lithiation of 3-<i>tert</i>-butyl and 3-<i>tert</i>-butoxycarbonylaminopyridine
作者:Charles Y. Fiakpui、Edward E. Knaus
DOI:10.1139/v87-193
日期:1987.6.1
The ortho-directed lithiation of 3-tert-butyl- or 3-tert-butoxycarbonylaminopyridines (3) with alkyllithiums and reaction with N,N-diethylbenzamide followed by acid hydrolysis gave 3-amino-4-benzoylpyridine (6) in good yield. Reaction of BTBO with the glycine derivatives 7a, b and then reaction with 6 afforded 3-alkoxycarbonylaminomethylcarbonylamino-4-benzoylpyridines 8a, b. Acid-catalyzed hydrolysis
3-叔丁基或 3-叔丁氧基羰基氨基吡啶 (3) 与烷基锂的邻位锂化反应,然后与 N,N-二乙基苯甲酰胺反应,然后酸水解,以良好的收率得到 3-氨基-4-苯甲酰基吡啶 (6)。BTBO 与甘氨酸衍生物 7a、b 反应,然后与 6 反应得到 3-烷氧基羰基氨基甲基羰基氨基-4-苯甲酰基吡啶 8a、b。8a、b 的酸催化水解和环化得到 9,甲基化得到 1,3-dihydro-1-methyl-5-phenyl-2H-pyrido[3,4-e]-1,4-diazepin-2-一 (10) 个 36% 的总产率来自 3a。