有机化学 ›› 2019, Vol. 39 ›› Issue (1): 117-121.DOI: 10.6023/cjoc201809026 上一篇    下一篇

所属专题: 庆祝陈庆云院士九十华诞

研究论文

含氟咪唑啉型有机催化剂在不对称Aldol反应中的研究

解晓娟a, 张忠a, 赵华欣a, 万文a,b, 郝健a,b   

  1. a 上海大学化学系 上海 200444;
    b 中国科学院上海有机化学研究所 有机氟化学重点实验室 上海 200032
  • 收稿日期:2018-09-21 修回日期:2018-12-05 发布日期:2018-12-07
  • 通讯作者: 万文, 郝健 E-mail:wanwen@shu.edu.cn;jhao@shu.edu.cn
  • 基金资助:

    国家自然科学基金基(Nos.21572128,21672139)及中国科学院上海有机化学研究所氟重点实验室开放基金资助项目.

Trifluoromethylated-Imidazolines as Efficient Organocatalyst for Asymmetric Aldol Reaction of Hydroxyacetone with Aldehydes

Xie Xiaojuana, Zhang Zhonga, Zhao Huaxina, Wan Wena,b, Hao Jiana,b   

  1. a Department of Chemistry, Shanghai University, Shanghai 200444;
    b Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032
  • Received:2018-09-21 Revised:2018-12-05 Published:2018-12-07
  • Contact: 10.6023/cjoc201809026 E-mail:wanwen@shu.edu.cn;jhao@shu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21572128, 21672139) and the Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Science.

手性1,2-二醇骨架是天然产物或生物活性分子构建过程中的重要骨架,而α-羟基酮参与的不对称Aldol缩合反应是实现手性1,2-二醇骨架的重要手段.设计并合成了含三氟甲基的咪唑啉型化合物,并将其应用于羟基丙酮和醛的不对称Aodol缩合反应.研究结果表明,当采用含氟咪唑啉(2R,4S)-4-苄基-1,2-二甲基-2-三氟甲基咪唑啉(1a)作为不对称Aldol反应的催化剂时,能够以产率高达96%、最高ee值达到99%及dr值达到15∶1的效率高效构建一系列顺式1,2-二醇产物.同时,我们也初步探讨了氟-氢键在不对称催化反应中的作用.

关键词: 不对称Aldol反应, 有机催化, 咪唑啉, 三氟甲基, 合成

Aldol reaction of hydroxyacetone is an all-purpose route to construct the 1,2-diol building blocks for the synthesis of multifarious natural products and biological active molecules. In this work, a new series of trifluoromethylated-imidazoline organocatalysts have been designed and synthesized. It is found that the trifluoromethylated chiral organocatalyst (2R,4S)-4-benzyl-1,2-dimethyl-2-(trifluoromethyl) imidazolidine (1a) has proved to be very efficient for the direct asymmetric aldol reaction of α-hydroxyketones with aldehydes to build the syn-1,2-diol building blocks. Among the synthesized syn-aldol products, a good yield (up to 96%) and high stereoselectivity (up to dr=15:1, 99% ee) could be obtained. The F—H bonding derived from trifluoromethyl group was proposed to play an important role in the stabilization of the transition state.

Key words: asymmetric aldol reaction, organocatalysis, imidazoline, trifluoromethyl, synthesis