Synthesis of Optically Active <b><i>C</i></b>-Allylglycine Derivatives and Conversion into Isoquinolones
作者:Udo Nubbemeyer、Nong Zhang
DOI:10.1055/s-2002-19804
日期:——
synthesized via an auxiliary controlled diastereoselective aza-Claisen rearrangement. The stereodirecting unit is placed on an auxiliary derived from commercially available (S)-proline. After N-allylation. the obtained optically active allylamines were reacted with various N-protected glycyl fluorides to give the (2R)-C-allylglycyl amides in good yields. The diastereoselectivity of the asymmetric allylation
C-烯丙基甘氨酰胺可以通过辅助控制的非对映选择性氮杂-克莱森重排有效合成。立体定向单元放置在衍生自市售 (S)-脯氨酸的辅助物上。N-烯丙基化后。获得的光学活性烯丙胺与各种N-保护的甘氨酰氟反应以良好的收率得到(2R)-C-烯丙基甘氨酰胺。不对称烯丙基化的非对映选择性在 1:1 和 >1:15 之间变化,具体取决于 N-保护基团、助剂和反应温度。同样,C-烯丙基甘氨酸衍生物可用作肽合成中的单体以合成(R)-脯氨酸衍生物或手性异喹诺酮类;后者应作为生物碱总合成的组成部分。