Synthesis of 2-phenylaminoadenosine from imidazole nucleosides.
作者:KIYOSHI OMURA、RYUJI MARUMOTO、YOSHIYASU FURUKAWA
DOI:10.1248/cpb.29.1870
日期:——
Three methods for the synthesis of 2-phenylaminoadenosine (1, CV-1808), a potent coronary vasodilator with prolonged action, were exploited. 1) The reaction of 5-amino-4-cyano-1-(β-D-ribofuranosyl) imidazole (7) with phenyl isothiocyanate gave 7-imino-5-phenylamino-3-(β-D-ribofuranosyl) imidazo [4, 5-d] [1, 3]-thiazine (11), which, on alkaline treatment, rearranged to 6-mercapto-2-phenylamino-9-(β-D-ribofuranosyl) purine (12). On methylation, 12 gave the 6-methylmercapto derivative (14), which was converted to 1 by treatment with ammonia. 2) 5-Amino-4-cyano-1-(β-D-ribofuranosyl) imidazole (7) reacted with phenyl cyanamide in methanolic ammonia, giving 1 and 2-aminoadenosine as a by-product. 3) Ethyl 5-amino-1-(β-D-ribofuranosyl)-4-carboximidate (21b) was directly obtained by treatment of 5-amino-1-(2, 3, 5-tri-O-propionyl-β-D-ribofuranosyl) imidazole-4-carboxamide (4) with Meerwein's reagent followed by deacylation, and this was led to 1 by the reaction with phenyl cyanamide.
开发了三种合成2-苯胺腺苷(1,CV-1808)的方法,这是一种具有持久作用的强效冠状动脉扩张剂。1)5-氨基-4-氰基-1-(β-D-呋喃核糖基)咪唑(7)与苯基异硫氰酸酯反应,生成7-亚氨基-5-苯胺基-3-(β-D-呋喃核糖基)咪唑并[4,5-d][1,3]噻嗪(11),后者经碱性处理后重排为6-巯基-2-苯胺基-9-(β-D-呋喃核糖基)嘌呤(12)。甲基化后,12生成6-甲硫基衍生物(14),通过氨处理转化为1。2)5-氨基-4-氰基-1-(β-D-呋喃核糖基)咪唑(7)在甲醇氨中与苯基氰胺反应,生成1和2-氨基腺苷作为副产品。3)通过5-氨基-1-(2,3,5-三-O-丙酰基-β-D-呋喃核糖基)咪唑-4-羧酰胺(4)与Meerwein试剂处理后去酰化,直接得到乙基5-氨基-1-(β-D-呋喃核糖基)-4-羧基咪唑盐(21b),然后通过与苯基氰胺反应生成1。