流动中环状(Z)-醛亚胺对映选择性催化Strecker反应:反应优化和可持续性

IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Antonella Ilenia Alfano, Andrea Sorato, Alessia Ciogli, Heiko Lange, Margherita Brindisi
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引用次数: 0

摘要

使用亚几何量的手性催化剂在非手性底物上进行催化对映选择性 Strecker 反应,是有效合成 α 氨基腈的一个不断发展的关键策略。我们在此披露了一种基于流程的对映选择性 Strecker 方法,该方法采用氰基甲酸乙酯作为相对安全的氰化源、金鸡纳树基催化剂和甲醇作为添加剂。通过对关键参数的深入探讨,确定了最有效的试剂混合模式、流动合成的最佳溶剂、催化剂的最小负载量、添加剂、温度和停留时间。新开发的方法可以直接引导反应,快速、完全地形成α-氨基腈产物,从而减少了在长期批量反应过程中由于吲哚啉降解而导致的产率下降。此外,我们在此提出了催化剂回收的简单程序,从而为进一步优化所建议的方法提供了可持续发展的初步提示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enantioselective catalytic Strecker reaction on cyclic (Z)-aldimines in flow: reaction optimization and sustainability aspects

Enantioselective catalytic Strecker reaction on cyclic (Z)-aldimines in flow: reaction optimization and sustainability aspects

Catalytic enantioselective Strecker reactions on an achiral substrate using sub-stoichiometric amounts of a chiral catalyst represent an evolving key strategy for the effective synthesis of α-amino nitriles. We herein disclosed the set-up of a flow-based methodology for enantioselective Strecker, employing ethyl cyanoformate as a relatively safe cyanide source, a cinchona-based catalyst, and methanol as additive. A thorough exploration of key parameters allowed the identification of the most efficient reagent mixing mode, the optimum solvent for the flow synthesis, minimum catalyst loading, additive, temperature, and residence time. The newly developed method allows straightforward reaction channeling towards the fast and complete formation of the α-amino nitrile products, thus reducing the yield drop due to indolenine degradation during long-lasting batch-wise reactions. Moreover, we herein provide preliminary hints for sustainability, by proposing a simple procedure for catalyst recycling, thus opening the way for further optimization of the proposed methodology.

Graphical Abstract

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来源期刊
Journal of Flow Chemistry
Journal of Flow Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
3.70%
发文量
29
审稿时长
>12 weeks
期刊介绍: The main focus of the journal is flow chemistry in inorganic, organic, analytical and process chemistry in the academic research as well as in applied research and development in the pharmaceutical, agrochemical, fine-chemical, petro- chemical, fragrance industry.
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