Integrated Chemical Process: Convenient Synthesis of Enantiopure 2-Hydroxymethyl-1,4-benzodioxane Derivatives under Iterative Catalysis of CsF
作者:Kazuhiro Kitaori、Yoshiro Furukawa、Hiroshi Yoshimoto、Junzo Otera
DOI:10.1002/1615-4169(20010129)343:1<95::aid-adsc95>3.0.co;2-s
日期:2001.1.29
One-pot processes to enantiopure 2-hydroxymethyl-1,4-benzodioxane derivatives have been established under catalysis of CsF. A sequence of O-alkylation of catechols with enantiopure 3-chloro-1,2-propanediol, tosylation of the alcohol, deprotection of the benzyl ether, and intramolecular etherification can be integrated. The O-alkylation is also feasible with enantiopure oxiranes. All reactions, except
在CsF的催化下,已经建立了对映纯2-羟基甲基-1,4-苯并二恶烷衍生物的一锅法。可以整合邻苯二酚与对映体纯的3-氯-1,2-丙二醇的O-烷基化,醇的甲苯磺酸化,苄基醚的脱保护和分子内醚化的序列。用对映纯的氧杂环丁烷也可以进行O-烷基化。除脱苄基作用外,所有反应均由单一催化剂CsF催化。用Pd-C对苄基醚进行氢化脱保护与CsF催化的反应兼容。集成的协议不仅提高了整个过程的效率,而且提高了总产量。