Syntheses of Racemic Diaminosugar Derivatives Starting from 1,2-Dihydropyridines and from Nitrosobenzene
作者:G�rard Augelmann、Jacques Streith、Hans Fritz
DOI:10.1002/hlca.19850680112
日期:1985.2.13
Racemic diaminosugars were easily obtained by a regio- and stereoselective three-step synthetis. In the first step, regiospecific hetero-Diels-Alder cycloadditions between 1,2-dihydropyridines 1a and 10 and nitrosobenzene led to the bicyclic compounds 2a and 11, respectively, cis-Glycol formation starting from these latter adducts, followed by hydrogenolysis of the NO bond and by exhaustive acetylation
外消旋二氨基糖很容易通过区域和立体选择性三步合成法获得。第一步,在1,2-二氢吡啶1a和10与亚硝基苯之间进行区域特异性杂Diels - Alder环加成,分别生成双环化合物2a和11,从这些后一加合物开始形成顺式乙二醇,然后将NO进行氢解键和OH基团的彻底乙酰化,导致二氨基糖5,二氨基甘露糖14和二氨基阿糖15。从1,2-二氢吡啶-1-甲酸苄酯开始时(1b),并使用相同的反应顺序,得到外消旋哌啶衍生物8。