Synthesis of <scp>d</scp>- and <scp>l</scp>-Deoxymannojirimycin via an Asymmetric Aminohydroxylation of Vinylfuran
作者:Michael H. Haukaas、George A. O'Doherty
DOI:10.1021/ol006907j
日期:2001.2.1
[figure: see text] The Sharpless catalytic asymmetric aminohydroxylation has been applied to 2-vinylfuran, producing beta-hydroxyfurfurylamine 5a with enantioexcess of > 86% and 21% yield from furfural. The Cbz and TBS protected amino alcohol 5a was converted into both the D- and L-isomers of deoxymannojirimycin (DMJ) and deoxygulonojirimycin in five to seven steps and 48% and 66% overall yields. The
[图:见正文] Sharpless催化不对称氨基羟基化反应已应用于2-乙烯基呋喃,生产的β-羟基糠胺5a的对映体过量> 86%,糠醛的收率为21%。Cbz和TBS保护的氨基醇5a以五到七个步骤转化为脱氧甘露糖霉素(DMJ)和脱氧古洛糖霉素的D-异构体和L-异构体,总收率分别为48%和66%。关键步骤包括使用aza-Achmatowicz反应,非对映选择性Luche还原,非对映选择性二羟基化和串联Cbz脱保护/还原胺化。