Alkylation of 6-amino-7H-purin-8(9H)-thione (8-sulfanyladenine, 1) with one equivalent of (R)-[(trityloxy)methyl]oxirane gave its S-alkyl derivative 2, which was converted to the 6-amino-7H-purin-8(9H)-one (3), while alkylation of 1 with two equivalents of (S)-[(trityloxy)methyl]oxirane afforded a mixture of N3,S-dialkylated product 4a, N9-monoalkyl and N7,N9-dialkyl derivatives of 6-amino-7H-purin-8(9H)-one, 5a and 6a, respectively. This approach can be used for rapid and easy transformation of 8-[(2-hydroxyalkyl)sulfanyl]adenines to the derivatives of 6-amino-7H-purin-8(9H)-one (8-hydroxyadenine) using NaH or Cs2CO3 in DMF. The course of the S→O transformation strictly depends on the character of the starting compounds and on the reaction conditions. N9-Alkyl-8-[(2-hydroxyalkyl)sulfanyl]adenines 10, 12, 14 and 17 were rapidly converted to the corresponding 6-amino-7H-purin-8(9H)-one derivatives 11, 13, 11 and 18, respectively. N9-Unsubstituted 2 reacts slowly, and N3-alkyl derivative 4a is stable under the same reaction conditions. The described transformation does not occur when the hydroxy group in 8-[(2-hydroxyalkyl)sulfanyl]adenine derivative 15 is protected. The reaction using NaH proceeds more rapidly than that using Cs2CO3.
将6-氨基-7H-嘌呤-8(9H)-硫酮(8-硫基腺嘌呤,1)与1当量的(R)-[(三苯甲氧基)甲基]环氧乙烷烷基化得到其S-烷基衍生物2,将其转化为6-氨基-7H-嘌呤-8(9H)-酮(3),而将1与2当量的(S)-[(三苯甲氧基)甲基]环氧乙烷烷基化得到一混合物,其中包括6-氨基-7H-嘌呤-8(9H)-酮的N3,S-二烷基化产物4a,6-氨基-7H-嘌呤-8(9H)-酮的N9-单烷基和N7,N9-二烷基衍生物5a和6a。这种方法可以用于将8-[(2-羟基烷基)硫基]腺嘌呤快速、简便地转化为6-氨基-7H-嘌呤-8(9H)-酮(8-羟基腺嘌呤)的衍生物,使用DMF中的NaH或Cs2CO3。S→O转化的过程严格取决于起始化合物的性质和反应条件。N9-烷基-8-[(2-羟基烷基)硫基]腺嘌呤10、12、14和17迅速转化为相应的6-氨基-7H-嘌呤-8(9H)-酮衍生物11、13、11和18。N9-未取代的2反应较慢,N3-烷基衍生物4a在相同的反应条件下稳定。当8-[(2-羟基烷基)硫基]腺嘌呤衍生物15中的羟基被保护时,所述的转化不会发生。使用NaH进行的反应比使用Cs2CO3进行的反应更迅速。