Enantioselective Synthesis of the Pyrrolidine Core of Endothelin Antagonist ABT-627 (Atrasentan) via 1,2-Oxazines
作者:Monika Buchholz、Hans-Ulrich Reißig
DOI:10.1002/ejoc.200300234
日期:2003.9
Diastereoselective syntheses of the pyrrolidine core 6a of the endothelin antagonist ABT-627 (Atrasentan) either as a racemic mixture or as an enantiopure compound are presented. The crucial steps of these syntheses utilized the highly diastereoselective conjugate addition of 1,3-benzodioxol-5-yllithium to racemic 6H-1,2-oxazine 3 or enantiopure 6H-1,2-oxazines 7 or 8, followed by trapping with ethyl
介绍了内皮素拮抗剂 ABT-627 (Atrasentan) 的吡咯烷核心 6a 的非对映选择性合成,作为外消旋混合物或对映体纯化合物。这些合成的关键步骤是利用 1,3-苯并二氧杂环己烷-5-基锂与外消旋 6H-1,2-恶嗪 3 或对映体纯 6H-1,2-恶嗪 7 或 8 的高度非对映选择性共轭加成,然后用乙基捕获氰基甲酸酯(曼德试剂)。得到的 5,6-二氢-4H-1,2-恶嗪转化为 2,3,4-三取代的吡咯烷 6a。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)