A <i>C</i><sub>2</sub>-Symmetric Chiral Pool-Based Flexible Strategy: Synthesis of (+)- and (−)-Shikimic Acids, (+)- and (−)-4-<i>epi</i>-Shikimic Acids, and (+)- and (−)-Pinitol
作者:Bakthavachalam Ananthan、Wan-Chun Chang、Jhe-Sain Lin、Pin-Hui Li、Tu-Hsin Yan
DOI:10.1021/jo402764v
日期:2014.4.4
concise, flexible, and readily scalable enantiodivergent synthesis of (+)- and (−)-shikimic acids and (+)- and (−)-4-epi-shikimic acids has emerged. This simple strategy not only provides an efficient approach to shikimic acids but also can readily be adopted for the synthesis of (+)- and (−)-pinitols. These concise total syntheses exemplify the use of pivotal allylic epoxide 14 and its enantiomer ent-14
通过新颖的酸促进的乙缩醛官能团重排与环氧化物单元的可控安装相结合,以对映体纯净形式生成关键的环氧化物中间体,该方法简单,简明,灵活且易于扩展,可以合成(+)-和(出现了-)-草酸以及(+)-和(-)-4-表-草酸。这种简单的策略不仅为sh草酸提供了一种有效的方法,而且可以轻松地用于合成(+)-和(-)-松醇。这些简明的整体合成举例说明了关键的烯丙基环氧化合物14及其对映体ent- 14的使用。容易得到的廉价的Ç 2 -对称升酒石酸(7)担任关键先驱。通常,此处的策略提供了使用四碳Chiron的简洁示例,并且很好地说明了功能化环己烷靶的合成。