作者:João R de Freitas Filho、Rajendra M Srivastava、Waldenberg J.P da Silva、Louis Cottier、Denis Sinou
DOI:10.1016/s0008-6215(02)00527-x
日期:2003.3
1,3-Dipolar cycloaddition of methylideneaniline N-oxide to sugar enones is described. The addition occurred exclusively from the side opposite to the aglycone affording the corresponding alkyl alpha-D-lyxo-hexopyranosid-(2,3:5',4')-phenylisoxazolidin-4-uloses. Hydrogenation of these compounds readily yielded the corresponding alkyl 3-deoxy-3-N-phenylaminomethyl-alpha-D-talopyranoside, that were readily
描述了亚甲基苯胺N-氧化物与糖烯酮的1,3-偶极环加成。该加成仅从糖苷配基的相反侧发生,得到相应的烷基α-D-lyxo-己吡喃糖苷-(2,3:5',4')-苯基异恶唑烷丁-4-ulose。这些化合物的氢化容易产生相应的烷基3-脱氧-3-N-苯基氨基甲基-α-D-塔洛吡喃糖苷,其易于转化为乙酸酯。通过1 H NMR研究和使用AM1方法的半经验分子轨道计算,确定了双环化合物的结构和构象。