Uridine 5′-monoselenoacetals as substrates for diastereoselective homolytic C-C bond formation
作者:Kazuhiro Haraguchi、Hiromichi Tanaka、Shigeru Saito、Satomi Kinoshima、Motoi Hosoe、Kazuhiro Kanmuri、Kentaro Yamaguchi、Tadashi Miyasaka
DOI:10.1016/0040-4020(96)00483-8
日期:1996.7
Uridine 5′-monoselenoacetals prepared by the seleno-Pummerer reaction of 5′-deoxy-5′-phenylseleno-uridines were used as substrates for radical-mediated reactions with allyltributyltin. The reaction of the 2′,3′-O-isopropylidene derivative gave cyclized products, 5-allyl-6,5′-cyclonucleosides, whereas those of the 2′,3′-bis-O-(tertbutyldimethylsilyl derivatives underwent the C-C bond formation at the
通过5'-脱氧-5'-苯基硒代尿苷的硒化-Pummerer反应制备的尿苷5'-单硒缩醛用作与烯丙基三丁基锡进行自由基介导的反应的底物。2',3'-O-异亚丙基衍生物的反应生成环化产物5-烯丙基-6,5'-环核苷,而2',3'-双-O-(叔丁基二甲基甲硅烷基衍生物的那些则经历了CC键在5'-位形成(5'S)-和(5'R)-异构体,讨论了两种反应的立体化学结果,还研究了烯丙基三丁基锡以外的自由基受体的使用。