A Practical Synthesis of <i>Trans</i>-3-Substituted Proline Derivatives through 1,4-Addition
作者:Peter Huy、Jörg-Martin Neudörfl、Hans-Günther Schmalz
DOI:10.1021/ol102613z
日期:2011.1.21
are important building blocks for conformationally restrained peptide analogs, was developed. The method relies on a Cu-catalyzed 1,4-addition of Grignard reagents to N-protected 2,3-dehydroproline esters, efficiently prepared in a new one-pot protocol. The 1,4-addition products are obtained with good trans-selectivity (dr 5:1 to 25:1). A nonracemic sample of N-Cbz-3-vinylproline (74% ee) was obtained
开发了实用的四步合成3-烷基,乙烯基和芳基取代的脯氨酸衍生物的方法,它们是构象受限的肽类似物的重要组成部分。该方法依赖于在新的一锅操作规程中有效制备的Cu催化的格氏试剂与N保护的2,3-脱氢脯氨酸酯的Cu催化的1,4-加成。得到的1,4-加成产物具有良好的反选择性(dr 5:1至25:1)。使用伊文思恶唑烷酮作为手性助剂获得了N -Cbz-3-乙烯基脯氨酸(74%ee)的非外消旋样品。