The synthesis of (R)- and (S)-spirobi-1,4-dioxane and related spirobicycles from D-fructose
作者:Jonathan Y. C. Chan、Leslie Hough、Anthony C. Richardson
DOI:10.1039/p19850001457
日期:——
Stereospecific syntheses of (R)- and (S)-spirobi-1,4-dioxane[(19) and (23) respectively] have been achieved starting from 1,2-O-ethylene-β-D-fructopyranose (6) and 2-(β-D-fructopyranosyloxy)ethanol (24) respectively, which are both readily available from 2′-chloroethyl β-D-fructopyranoside. In the former case the triol grouping was cleaved by sodium periodate, and the dialdehyde (7) reduced with sodium
从1,2 - O-乙烯-β - D-果糖基吡喃糖开始合成(R)-和(S)-spirobi-1,4-二恶烷[(19)和(23)]的立体特异性合成(6)和2-(β- D-果糖吡喃糖基氧基)乙醇(24),它们都可以容易地从2'-氯乙基β- D-果糖吡喃糖苷中获得。在前一种情况下,三醇基团被高碘酸钠裂解,二醛(7)用硼氢化钠还原得到二醇(8),将其闭环得到(S)-异构体。在后一种情况下,化合物(24)的三醇基团也被高碘酸盐裂解,得到1,4,7,10-四氧杂螺-[5.5]十一烷-3,11-二醇,其以3,11-表异构体的混合物形式存在。 (26)。依次进行乙酰化,用溴化氢-乙酸处理,再用氢化锂铝还原,即可得到(R)-异构体。将二醇(8)转化为二甲磺酸酯,然后用硫代乙酸酯选择性置换,得到单甲磺酸酯(18),与碱反应后得到(R)-1,7,10-trioxa-4-thiaspiro [5.5]十一烷(22)