Some novel nucleoside rearrangements effected by (diethylamino)sulphur trifluoride: synthesis and antiviral properties of some fluorine-containing 3′-azido-3′-deoxythymidine derivatives
作者:Anne E. Lloyd、Paul L. Coe、Richard T. Walker、Oliver W. Howarth
DOI:10.1016/s0022-1139(00)80089-5
日期:1993.6
The reaction of pyrimidine nucleoside 5′-aldehydes with (diethylamino)sulphur trifluoride(DAST) to produce 5′-deoxy-5′,5′-difluoronucleosides is reported. The preferred reactionis the production of the O2,5′-anhydro-5′-fluoronucleoside. If this is prevented by substitutionat 04 or N-3 then, in the former case, either DAST no longer reacts or underdrastic conditions the C(1′)N(1) bond breaks and the
报道了嘧啶核苷5'-醛与(二乙基氨基)三氟化硫(DAST)反应生成5'-脱氧-5',5'-二氟核苷。优选reactionis生产的O 2,5'-脱水-5'-氟核苷。如果通过在0 4或N-3处取代来防止这种情况,那么在前一种情况下,DAST不再反应或在剧烈条件下C(1')N(1)键断裂,杂环碱基仍被C-5'连接→O 2糖基氟化物。在后一种情况下,2',3'-O-异丙基亚氨基尿苷的5'-醛为5'-脱氧-5',5'-二氟化合物作为唯一可识别的产物。以AZT的5'-醛(在N-3处适当保护)为起始原料,用DAST处理可生成糖基氟和其5'-脱氧-5',5'-二氟AZT衍生物的非对映异构体混合物,其中3'可以分离出-叠氮基-3',5'-二脱氧氧基-5',5'-二氟胸苷。该化合物无毒,对高达100μM的1型人类免疫缺陷病毒(HIV-1)也没有任何活性。