Synthesis of amino sugars via isoxazolines DL- and D-lividosamine (2-amino-2,3-dideoxy-ribo-hexose) derivatives from 4-vinyl-1,3-dioxolanes and nitroacetaldehyde acetals
作者:Volker Jäger、Rudolf Schohe
DOI:10.1016/0040-4020(84)80002-2
日期:1984.1
1,3-Dipolar cycloaddition of nitrile oxides, generated from nitroethanol and nitroacetaldehyde derivatives 3, 21 and 22, respectively, and of benzonitrile oxide to 4-vinyldioxolanes 1, 2 gave ca 4:1 erythro/threo mixtures of corresponding isoxazolines. LAH reduction of erytho isoxazolines proceeded with similar (ca 4:1) selectivity to furnish protected ribo-amino-polyols 11, 15,19, DL- and D-lividosamines
氧化腈的1,3-偶极环加成,从硝基乙醇和nitroacetaldehyde衍生物产生的3,21和22,分别和苄腈氧化物4- vinyldioxolanes 1,2给CA 4:1赤式/苏式对应异恶唑啉的混合物。的LAH还原erytho异恶唑啉继续进行类似(CA 4:1)选择性配料受保护的核糖-氨基-多元醇11,15,19,和DL- d-lividosamines 31和33分别作为主产品。DL-李维糖胺衍生物33通过结晶获得纯产物。在D系列中,将相应的核糖/阿拉伯糖混合物D- 31 / D- 32转化为已知的α-甲基D-脂维糖胺D- 37。