Asymmetric Synthesis of Both Enantiomers of <i>a</i><i>nti</i>-4,4,4-Trifluorothreonine and 2-Amino-4,4,4-trifluorobutanoic Acid
作者:Zhong-Xing Jiang、Ying-Ying Qin、Feng-Ling Qing
DOI:10.1021/jo0344384
日期:2003.9.1
A short and efficient enantioselective synthesis of both enantiomers of anti-4,4,4-trifluorothreonine and 2-amino-4,4,4-trifluorobutanoic acid was successfully developed. Trifluoromethylation of benzyl-protected bromoalkene 4 provided key intermediate trifluoromethylated trans-disubstituted alkene 2 in good yield. The sequence then involved Sharpless asymmetric dihydroxylation, nucleophilic opening
成功开发了一种短而有效的对映体,其合成抗4,4,4-三氟苏氨酸和2-氨基-4,4,4-三氟丁酸的对映体。苄基保护的溴代烯烃4的三氟甲基化以良好的收率提供了关键的中间体三氟甲基化的反式二取代烯烃2。然后,该序列涉及Sharpless不对称二羟基化,环状硫酸盐与NaN(3)的亲核打开,钯催化的选择性氢化和氧化。