An Efficient Route toward 2-Amino-β-<scp>d</scp>-galacto- and -glucopyranosides via Stereoselective Michael-Type Addition of 2-Nitroglycals
作者:Weihua Xue、Jiansong Sun、Biao Yu
DOI:10.1021/jo900609s
日期:2009.7.17
Under the catalysis of DMAP or PPY in CH2Cl2, the Michael-type addition of nucleophiles to 2-nitrogalactal or 2-nitroglucal leads in excellent yields and stereoselectivity to the corresponding β-galacto- or -glucopyranosides, which are ready precursors to the biologically significant β-d-galactosamine and -glucosamine units.
在CH 2 Cl 2中DMAP或PPY的催化下,亲核试剂向2-硝基半乳糖或2-硝基葡萄糖的迈克尔型加成反应导致相应的β-半乳糖或吡喃葡萄糖苷具有良好的收率和立体选择性,而β-半乳糖或-吡喃葡萄糖苷已是这些化合物的现成物质。具有生物学意义的β- d-半乳糖胺和-葡萄糖胺单元。