作者:Mustafa Eskici、Abdullah Karanfil、M. Sabih Özer、Yalçın Kabak、İnci Durucasu
DOI:10.1080/00397911.2018.1489057
日期:2018.9.17
Abstract A practical and efficient asymmetric synthesis of (S)-dihydrokavain from known ethyl (S)-2-hydroxy-4-phenylbutanoate which is, in turn, readily available from l-malic acid as a cheap chiral pool material is described using regioselective ring-opening of the 1,2-cyclic sulfate with lithium-3,3,3-triethoxypropiolate and subsequent HgO/H2SO4-mediated lactonization as the key steps. Its opposite
摘要描述了使用区域选择性从已知的 (S)-2-羟基-4-苯基丁酸乙酯合成 (S)-二氢卡瓦因的实用且有效的不对称合成,而后者又可从 L-苹果酸中作为廉价的手性池材料轻松获得。以 3,3,3-三乙氧基丙炔酸锂和随后的 HgO/H2SO4 介导的内酯化为关键步骤对 1,2-环硫酸盐进行开环。其相反的对映异构体 (R)-二氢卡瓦因也使用相同的反应序列从 d-苹果酸合成,用于光学纯度测定。图形概要