Asymmetric Syntheses of (−)-ADMJ and (+)-ADANJ: 2-Deoxy-2-amino Analogues of (−)-1-Deoxymannojirimycin and (+)-1-Deoxyallonojirimycin
作者:Stephen G. Davies、Aude L. A. Figuccia、Ai M. Fletcher Paul、M. Roberts、James E. Thomson
DOI:10.1021/acs.joc.6b01107
日期:2016.8.5
ring-opening of the corresponding aziridinium intermediates with a tethered carbamate moiety) to give oxazolidin-2-ones was initially optimized on a model system. Subsequent application of this methodology to two enantiopure bishomoallylic amines (which were produced via aminohydroxylation of an α,β-unsaturated ester, partial reduction, and reaction of the corresponding aldehyde with vinylmagnesium bromide)
本文描述了(-)-ADMJ和(+)-ADANJ,(-)-1-脱氧甘露糖霉素和(+)-1-脱氧烯隆吉利霉素的2-脱氧-2-氨基类似物的不对称合成。首先在模型系统上优化了用于将双烯丙基烯丙基胺进行闭环碘化胺化,然后进行原位扩环(通过分子连接的带有环氨基甲酸酯部分的叠氮基中间体的分子内开环)的方法,以得到恶唑烷定-2-酮。这种方法的后续应用两个对映体纯的胺bishomoallylic(其分别通过α,β不饱和酯,部分还原,并用乙烯基溴化镁相应的醛的反应的氨羟化生产)也进行伴随Ñ-进行脱苄基作用,得到相应的非对映异构纯的(> 99:1 dr)恶唑烷二-2-酮。随后对这些对映体纯模板进行脱保护,分别得到(-)-ADMJ和(+)-ADANJ作为单一非对映异构体,总收率分别为16%和24%。