Stereo-Selective Preparation of Teneraic Acid, <i>trans</i>-(2<i>S</i>,6<i>S</i>)-Piperidine-2,6-dicarboxylic Acid, <i>via</i> Anodic Oxidation and Cobalt-Catalyzed Carbonylation
作者:Yusuke Amino、Seiichi Nishi、Kunisuke Izawa
DOI:10.1248/cpb.c17-00391
日期:——
Teneraic acid (piperidine-2,6-dicarboxylic acid) is a naturally occurring imino acid that comprises three stereoisomers due to its two asymmetric centers at C2 and C6. The configuration of natural teneraic acid is reported to correspond to trans-(2S,6S). However, a few studies are focused on the stereospecific synthesis of trans-(2S,6S)-teneraic acid. The present study investigates a convenient synthetic
硬脂酸(哌啶-2,6-二羧酸)是一种天然存在的亚氨基酸,由于其在C2和C6的两个不对称中心而包含三个立体异构体。据报道,天然腱酸的构型对应于反式(2S,6S)。然而,一些研究集中在反式-(2S,6S)-戊酸的立体有择合成上。本研究研究了一种方便的合成方法,该方法包括区域特异性阳极氧化和立体特异性钴催化的羰基化反应以获得反式(2S,6S)-戊酸。(S)-N-苯甲酰基-α-甲氧基哌酸甲酯是甲基(S)-N的阳极氧化反应,它显示出与分子内酰胺羰基化的中间体(N-α-羟烷基酰胺)相对应的结构的关键中间体。 -苯甲酰基哌酸酯。随后,钴催化的羰基化将(S)-N-苯甲酰基-α-甲氧基哌酸甲酯以良好的光学纯度(> 95%对映体过量(ee))转化为反式(2S,6S)-N-苯甲酰基-戊酸二甲酯中等收率(63%)。最后,通过酸性水解进行脱保护反应以获得反-(2S,6S)-戊酸。通过比较其物理性质与先前报道的顺式-