Studies on the transformation of nitrosugars into iminosugars III: synthesis of (2R,3R,4R,5R,6R)-2-(hydroxymethyl)azepane-3,4,5,6-tetraol and (2R,3R,4R,5R,6S)-2-(hydroxymethyl)azepane-3,4,5,6-tetraol
作者:Amalia M. Estévez、Raquel G. Soengas、José M. Otero、Juan C. Estévez、Robert J. Nash、Ramón J. Estévez
DOI:10.1016/j.tetasy.2009.12.006
日期:2010.1
A divergent synthesis of the two novel polyhydroxylated azepanes (2R,3R,4R,5R,6R)-2-(hydroxymethyl)azepane-3,4,5,6-tetraol and (2R,3R,4R,5R,6S)-2-(hydroxymethyl)azepane-3,4,5,6-tetraol from d-mannose is described. The method involves a Henry reaction between dimethyl-tert-butylsilyl 2,3-O-isopropylidene-α-d-lyxo-pentodialdo-1,4-furanoside and 2-nitroethanol followed by a reductive ring closure of the
两种新的多羟基化氮杂环丙烷(2 R,3 R,4 R,5 R,6 R)-2-(羟甲基)氮杂环庚烷-3,4,5,6-四醇和(2 R,3 R,描述了来自d-甘露糖的4 R,5 R,6 S)-2-(羟甲基)氮杂环庚烷-3,4,5,6-四醇。该方法涉及之间的亨利反应二甲基-叔丁基甲硅烷基-2,3- ö异亚丙基α-D-来苏-pentodialdo -1,4-呋喃糖苷和2-硝基乙醇,然后将所得差向异构硝基醛醇的还原环合。糖苷酶抑制试验表明(2 R,3[R,4 - [R,5 - [R,6小号)-2-(羟甲基)氮杂环庚烷-3,4,5,6-四醇显示出微弱但选择性抑制对α-L-岩藻糖苷。