Stereocontrolled Synthesis of Enantiopure Polyhydroxylated Azetidines via 1,2-Oxazines
作者:Hans-Ulrich Reissig、Vjekoslav Dekaris
DOI:10.1055/s-0029-1218531
日期:2010.1
A set of new enantiopure polyhydroxylated azetidine derivatives has been prepared. The key starting materials, 3,6-dihydro-2H-1,2-oxazines, were subjected to a hydroboration―oxidation sequence to introduce the required 5-hydroxy group. Subsequent cleavage of the N―O bond with samarium diiodide, selective protection of the primary hydroxyl group, and ring closure after activation of the secondary hydroxyl
制备了一套新的对映纯多羟基化氮杂环丁烷衍生物。关键原料 3,6-二氢-2H-1,2-恶嗪经过硼氢化-氧化序列以引入所需的 5-羟基。随后用二碘化钐裂解 N-O 键,选择性保护伯羟基,并在仲羟基活化后闭环,提供受保护的氮杂环丁烷衍生物。该序列的每个单独步骤的功效取决于起始材料的配置。三种代表性的氮杂环丁烷衍生物被转化为脱保护的多羟基化氮杂环丁烷,它们是有趣的候选糖苷酶抑制剂。