Enantiospecific synthesis of (1S,2S,5R,6S)-2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid by a modified Corey-Link reaction
作者:Carmen Domínguez、Jesús Ezquerra、S. Richard Baker、Stéphane Borrelly、Lourdes Prieto、Modesta Espada、Carmen Pedregal
DOI:10.1016/s0040-4039(98)02092-9
日期:1998.12
6S)-2-Aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid (LY354740) was synthesised enantiospecifically from a sugar derived enantiomerically pure cyclopentenone. The α-amino acid stereogenic centre was formed by reacting the ketone with chloroform anion and then the alcohol so formed was reacted with sodium azide/DBU in methanol to give an azido ester. Critically, this modified Corey-Link reaction gives
(1S,2S,5R,6S)-2-氨基双环[3.1.0]己烷-2,6-二羧酸(LY354740)是由糖衍生的对映体纯的环戊烯酮对映体特异性合成的。通过使酮与氯仿阴离子反应形成α-氨基酸立体异构中心,然后使如此形成的醇与叠氮化钠/ DBU在甲醇中反应,得到叠氮酯。至关重要的是,这种改良的Corey-Link反应为传统的Bucherer-Bergs和Strecker反应提供了相反的立体化学结果。将叠氮化物还原并酰化,将1,2二醇脱氧并除去保护基,得到ee> 98%的LY354740。