Nucleic acid related compounds.<b>81</b>. Syntheses of 9-(3-deoxy-β-D-<i>threo</i>-pentofuranosyl)adenine, the core nucleoside of the extraordinarily selective antibiotic agrocin 84, and simplified structural component analogues
作者:Ravi Vinayak、Fritz Hansske、Morris J. Robins
DOI:10.1002/jhet.5570300504
日期:1993.10
Alternative syntheses of 9-(3-deoxy-β-D-threo-pentofuranosyl)adenine (4), the core nucleoside of agrocin 84 [and its 2′-deoxy threo isomer 5] were devised: (1) direct conversion of 9-(β-D-arabinofuranosyl)adenine into 9-(2,3-anhydro-β-D-lyxofuranosyl)adenine and regioselective opening of its oxirane ring with sodium borohy-dride to give 4 and 5(˜7.5:1); (2) treatment of adenosine with sodium hydride
设计了9-(3-脱氧-β-D-苏-戊呋喃糖基)腺嘌呤的替代合成方法(4),农杆菌素84 [及其2'-脱氧苏式异构体5 ]的核心核苷:(1)直接转化9 -将(-β-D-阿拉伯呋喃糖基)腺嘌呤转化成9-(2,3-脱水-β-D-呋喃糖基)腺嘌呤,并用硼氢化钠将其环氧乙烷环区域选择性地打开,得到4和5(〜7.5:1);(2)用氢化钠和2,4,6-三异丙基苯-磺酰氯处理腺苷,并用三乙基硼氢化锂将所得的2'(3')-磺酸盐进行还原性[1,2]-氢化物移位重排,得到三乙基硼氢化锂。给4和5(〜2:1); (3)对9- [2(3),5-双-O-(叔丁基二甲基甲硅烷基)-β-D-阿拉伯呋喃糖基]腺嘌呤的苯氧基硫代羰基酯进行巴顿脱氧,并脱保护得到4和2 ′-脱氧腺苷(〜5∶1)。方法(2)和(3)给出的产率较低。探索了简化的6- N-和5'- O-腺苷氨基磷酸酯模型化合物的合成,以检查针对农杆菌素84提出的结构中此类特征的潜在途径。