An Efficient Route to β-<scp>d</scp>-Isoxazolidinyl Nucleosides via Diastereoselective Michael Addition of Hydroxylamine to Unsaturated Esters
作者:Yuejun Xiang、Hung-Jang Gi、Deqiang Niu、Raymond F. Schinazi、Kang Zhao
DOI:10.1021/jo9710588
日期:1997.10.1
beta-D-isoxazolidinyl pyrimidine and purine nucleosides are described. Michael addition of N-methylhydroxylamine to alpha,beta-unsaturated esters was investigated. Both E- and Z-esters 10E and 10Z produced the same intermediates which were cyclized to isoxazolidin-5-ones 8 with high diastereoselectivity. The major isoxazolidin-5-one 8a was reduced and acetylated to acetate 11 for the preparation of nucleosides