Asymmetric Dihydroxylation of <scp>d</scp>-Glucose Derived α,β-Unsaturated Ester: Synthesis of Azepane and Nojirimycin Analogues
作者:Dilip D. Dhavale、Shankar D. Markad、Narayan S. Karanjule、J. PrakashaReddy
DOI:10.1021/jo049509t
日期:2004.7.1
The asymmetric dihydroxylation of a d-glucose derived α,β-unsaturated ester 3 afforded syn vicinal diols in good to high diastereoselectivity. The conversion of these vicinal diols to the corresponding cyclic sulfate, regio-, stereoselective nucleophilic ring opening by sodium azide, and LAH reduction afforded amino heptitols 7a,b that were converted to azepane 1c,d and nojirimycin analogues 2c,d.
d-葡萄糖衍生的α,β-不饱和酯3的不对称二羟基化提供了具有良好至高非对映选择性的合成邻二醇。这些邻位二醇通过叠氮化钠转化为相应的环状硫酸盐,区域,立体选择性亲核开环和LAH还原,得到氨基庚糖醇7a,b,其被转化为氮杂环庚烷1c,d和诺奇霉素类似物2c,d。