New Optically Active 4-Alkoxyprolinol Ethers Derived from trans-4-Hydroxy-L-proline
作者:Nora M. Friedemann、Astrid Eustergerling、Udo Nubbemeyer
DOI:10.1002/ejoc.201101156
日期:2012.2
(2S,4R)-trans-4-Hydroxy-L-proline has been used as thechiral-pool source in the efficient syntheses of optically active protected 4-hydroxyprolinols. After N-acyl protection andester formation, the first ether moiety was introduced maintaining the chiral centre adjacent to the ester. Then, reduction of the ester delivered the corresponding carbinol, which had to be alkylated selectively to avoid side
(2S,4R)-trans-4-Hydroxy-L-proline 已被用作手性池源,用于有效合成光学活性保护的 4-羟基脯氨醇。N-酰基保护和酯形成后,引入第一个醚部分,保持与酯相邻的手性中心。然后,酯的还原产生相应的甲醇,必须选择性地将其烷基化以避免与 N-保护基团发生副反应。最后,去除 N-酰基官能团以生成显示定义取代模式的目标甲基和叔丁基醚。如此形成的旋光4-烷氧基脯氨醇醚可用作生物活性化合物中的核心片段或用作合适起始材料中的稳定手性辅助亚单元。