作者:Ernesto G. Occhiato、Dina Scarpi、Antonio Guarna
DOI:10.1002/ejoc.200700849
日期:2008.1
A new synthetic route to enantiopure (2S,4R)-4-hydroxypipecolic acid from commercial ethyl (3S)-4-chloro-3-hydroxybutanoate is reported. The synthesis is based on the Pd-catalyzed methoxycarbonylation of a 4-alkoxy-substituted δ-valerolactam-derived vinyl triflate followed by the stereocontrolled hydrogenation of the enamine double bond. The final product was obtained after exhaustive hydrolysis in
报道了从商业 (3S)-4-氯-3-羟基丁酸乙酯合成对映体纯 (2S,4R)-4-羟基哌啶酸的新途径。该合成基于 Pd 催化的 4-烷氧基取代的 δ-戊内酰胺衍生的三氟甲磺酸乙烯酯的甲氧基羰基化,然后是烯胺双键的立体控制氢化。经过 10 个步骤以 20% 的产率彻底水解后获得最终产品。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)