作者:Kosaku Hirota、Kazunori Kazaoka、Itaru Niimoto、Hironao Sajiki
DOI:10.1039/b300557g
日期:2003.4.14
An efficient and general method for the synthesis of 2,9-disubstituted 8-hydroxyadenines, which are expected to have various biological activities, was realized. 5-Amino-4-cyano-2-hydroxyimidazoles (1) were prepared from aminomalononitrile and isocyanates as key intermediates. The condensation of 1a with amidines, imidates, guanidine, urea and thioureas afforded 8-hydroxyadenines (2–6) possessing various substituents at the 2-position. Furthermore, selective alkylation of 2-amino- and 2-hydroxyadenines (4 and 6) successively proceeded to give the corresponding 2-alkylamino- and 2-alkoxyadenines (5 and 7), respectively. 2-Alkylthioadenines (15) were prepared by an analogous reaction of 1a with benzoyl isothiocyanate and subsequent S-alkylation. The imidazoles 1 are most useful intermediates for the synthesis of 8-hydroxyadenine derivatives.
一种高效且通用的方法被实现,用于合成预期具有多种生物活性的2,9-二取代的8-羟基腺苷。5-氨基-4-氰基-2-羟基咪唑(1)是从氨基丙腈和异氰酸酯作为关键中间体制备的。将1a与氨基脲、咪唑、胍、尿素和硫脲缩合,得到在2位具有各种取代基的8-羟基腺苷(2–6)。此外,对2-氨基和2-羟基腺苷(4和6)进行选择性烷基化,顺利实现,分别得到相应的2-烷基氨基和2-烷氧腺苷(5和7)。2-烷基硫腺苷(15)是通过1a与苯甲酰异硫氰酸酯的类似反应以及随后S-烷基化制备的。咪唑类化合物1是合成8-羟基腺苷衍生物最有用的中间体。