Synthesis of 2,2-Disubstituted and 2,2,3-Trisubstituted 1,4-Dioxane-Derived Building Blocks
作者:Bohdan V. Vashchenko、Andriy V. Bondarenko、Yevhenii K. Kozyriev、Oleksandr O. Grygorenko
DOI:10.1055/a-2092-9205
日期:2023.10
obtained. The utility of the method was demonstrated by multigram preparation (up to 300 g; 30 g average scale of the final products) of 2,2-dimethyl-1,4-dioxane and 5,8-dioxaspiro[3.5]nonane building blocks, i.e. carboxylic acids, alcohols, amines, aldehyde, ketones, and bromides. Additional synthetic possibilities were shown by the preparation of selected examples of 1,4-dioxane-containing acetylenes, thiols
描述了一种制备 2,2-二取代和 2,2,3-三取代 1,4-二恶烷衍生结构单元的方法。该反应顺序以带有附加苄氧基的二甲基或螺环丁基取代的环氧乙烷作为起始原料开始。1,4-二恶烷环构建的关键步骤包括用乙二醇单锂盐进行环氧乙烷开环,然后对所得二醇进行两步环化。该方法的实用性通过2,2-二甲基-1,4-二恶烷和5,8-二氧杂螺[3.5]壬烷结构单元的多克制备(最多300克;最终产品的平均规模为30克)来证明,即羧酸、醇、胺、醛、酮和溴化物。通过制备含 1,4-二恶烷的乙炔的选定实例,显示了其他合成可能性,