Stereoselective Syntheses of<i>α</i>-D- and<i>β</i>-D-Ribofuranosides Catalyzed by the Combined Use of Silver Salts and Their Partners
作者:Naoyuki Shimomura、Teruaki Mukaiyama
DOI:10.1246/bcsj.67.2532
日期:1994.9
α-d-Ribofuranosides are stereoselectively synthesized in high yields from 2,3,5-tri-O-benzyl-1-O-iodoacetyl-d-ribofuranose (1) and trimethylsilylated nucleophiles by the use of silver salts in the coexistence of 3 molar amounts of lithium perchlorate, while β-d-ribofuranosides are prepared predominantly in high yields by the reaction of 1 and trimethylsilylated nucleophiles or 2,3,5-tri-O-benzyl-d-ribofuranose and free alcohols by using [diphenyltin sulfide/silver salt] or [Lawesson’s reagent/silver salt] combined catalyst system.
α-d-核呋喃糖苷是由 2,3,5-三-O-苄基-1-O-碘乙酰-d-核呋喃糖(1)和三甲基硅烷基化的亲核物通过使用银盐与 3 摩尔量的高氯酸锂共存进行立体选择性高产率合成的、而使用[二苯基硫化锡/银盐]或[Lawesson 试剂/银盐]组合催化剂体系,通过 1 和三甲基硅烷化亲核物或 2,3,5-三-O-苄基-d-呋喃三糖与游离醇的反应,主要可以高产率制备出 β-d-呋喃核苷。