作者:Christian Chapuis、Eric Walther、Fabrice Robvieux、Claude-Alain Richard、Laurent Goumaz、Jean-Yves de Saint Laumer
DOI:10.1002/hlca.201500257
日期:2016.2
For the synthesis of methyl jasmonate (1), via the strategic intermediates 3, 4, and 6a, we constructed a synthetic network via the diverse intermediates 7–10, 13, 14, 17, and 18. This allowed us to compare the efficiency of more than 20 novel routes. The most productive pathway with a total yield of 38% is represented by the sequence→5a→5m→13b→13a→6a→4 and proceeds via sequential bromination, basic
对于茉莉酮酸甲酯(合成1),通过战略中间体3,4,和6a中,我们构建了合成的网络通过多样化中间体7 - 10,13,14,17,和18。这使我们能够比较20多种新颖路线的效率。总产量为38%的最高产途径由以下顺序表示:5a → 5m → 13b → 13a → 6a → 4,并通过顺序溴化,碱性消除,脱甲氧甲氧基化,异构化,最后是Lindlar加氢。最短的选择方式2a →[((E,E)‐ 12b ]→ 3 → 4)是基于Naef方法的改进的两锅法序列,该方法基于廉价环戊酮(2a)与巴豆醛之间的醛醇缩合,与原位科里 Chaykovsky相转移条件下的环丙烷化。然后将关键中间体3简单地热解,得到4总产量的27%。通过六步偏差→ 5a → 5c → 8c → 13a → 6a → 4的替代异构化方法虽然效率更高,但更长一些,总产率为32%。或者,通过五步顺序→ 5a → 5c → 2h → 2i