A practical synthetic protocol for the preparation of enantioenriched 4‐allyl oxazol‐5‐ones was developed. The key Pd‐catalyzed decarboxylative allylation allowed the attainment of the allylated derivatives in very good yields (83–98 %) and with ee up to 85 %. The corresponding quaternary amino acids can be recovered in their enantiopure form or in high optical purity after a single recrystallization
开发了一种实用的合成方案,用于制备对映体富集的4-烯丙基
恶唑5-酮。关键的
钯催化脱羧烯丙基化使烯丙基化衍
生物的收率很高(83-98%),而ee最高可达85%。在单个重结晶步骤后,可以其对映体纯形式或高光学纯度回收相应的季
氨基酸。