Facile syntheses of 4-(trifluoromethyl)-L-spinacine and 4-(trifluoromethyl)spinaceamine
作者:Shozo Fujii、Yasuo Maki、Hiroshi Kimoto、Louis A. Cohen
DOI:10.1016/s0022-1139(00)81956-9
日期:1987.5
Reaction of L-histidine with trifluoroacetaldehyde ethyl hemiacetal (TFAE) in boiling water provides 4-(trifluoromethyl)-L-spinacine, 4-(trifluoromethyl)-L-4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine-6-carboxylic acid, in near quantitative yield. The product contains two diastereoisomers in the ratio 68 : 32. The isomers were separated (silica gel) as their protected derivatives, 5-N-(trifluoroac
L-组氨酸与三氟乙醛乙基半缩醛(TFAE)在沸水中反应,生成4-(三氟甲基)-L-丝氨酸碱,4-(三氟甲基)-L-4,5,6,7-四氢-1H-咪唑[4, 5-c]吡啶-6-羧酸,接近定量收率。该产物包含两种非对映异构体,比例为68:32。分离出异构体(硅胶)作为其受保护的衍生物5-N-(三氟乙酰基)-4-(三氟甲基)-L-藤氨酸甲酯,并通过酸进行再生水解。与组胺的类似反应以91%的产率提供了4-(三氟甲基)菠菜胺。