Synthesis of a Chiral α-(Aminooxy)arylacetic Ester. II. A Route through a Chiral 2-Hydroxy-2-phenylacetic Acid Derivative
作者:Hisao Iwagami、Masanobu Yatagai、Masakazu Nakazawa、Haruo Orita、Yutaka Honda、Takashi Ohnuki、Toshihide Yukawa
DOI:10.1246/bcsj.64.175
日期:1991.1
synthetic route has been developed for the synthesis of a chiral α-(aminooxy) ester (S)-16, which is a synthetic intermediate for a potent antipseudomonal cephalosporin antibiotic M-14659. In this synthetic route, the key intermediate is α-hydroxy acid (R)-7 (100%ee), which is prepared by an asymmetric reduction of α-keto ester with NaBH4-(R,R)-tartaric acid followed by a hydrolysis and an optical resolution
已经开发了一种简单实用的合成路线,用于合成手性 α-(氨基氧基) 酯 (S)-16,这是一种有效的抗假单胞菌头孢菌素抗生素 M-14659 的合成中间体。在该合成路线中,关键中间体是 α-羟基酸 (R)-7 (100%ee),它是由 α-酮酯与 NaBH4-(R,R)-酒石酸不对称还原,然后通过使用 L-Leu-NHNH2 进行水解和光学拆分。(S)-16 由 (R)-7 通过 3 个步骤立体选择性地获得。HPLC 分析和 NMR 研究证明,由此制备的 (S)-16 是完全光学纯的。