Nucleic Acid Related Compounds. 118. Nonaqueous Diazotization of Aminopurine Derivatives. Convenient Access to 6-Halo- and 2,6-Dihalopurine Nucleosides and 2‘-Deoxynucleosides with Acyl or Silyl Halides<sup>1</sup>
作者:Paula Francom、Morris J. Robins
DOI:10.1021/jo020625a
日期:2003.1.1
6-dichloropurine nucleoside 2, and acetyl chloride/BTEA-NO2 was equally effective ( approximately 85%, without chromatography). TMS-Br/tert-butyl nitrite/dibromomethane gave crystalline 2-bromo-6-chloro analogue 3 (85%). (Chloro or bromo)-dediazoniation of 3',5'-di-O-acetyl-2'-deoxyadenosine (4) gave the 6-[chloro (5, 63%) or bromo (6, 80%)]purine deoxynucleosides, and 2',3',5'-tri-O-acetyladenosine
在二氯甲烷中用TMS-Cl和亚硝酸苄基三乙铵(BTEA-NO2)处理9-(2,3,5-三-O-乙酰基-β-d-呋喃呋喃糖基)-2-氨基-6-氯嘌呤(1)结晶的2,6-二氯嘌呤核苷2和乙酰氯/ BTEA-NO2同样有效(约85%,无色谱)。TMS-Br /亚硝酸叔丁酯/二溴甲烷得到结晶的2-溴-6-氯类似物3(85%)。3',5'-二-O-乙酰基-2'-脱氧腺苷(4)的(氯或溴)脱氮重氮反应生成6- [氯(5,63%)或溴(6,80%)]嘌呤脱氧核苷,和2′,3′,5′-三-O-乙酰腺苷(8)转化为6-氯嘌呤核苷9(71%)。