一种用于不对称化反应的氨基化催化剂
Zeming Wang1, Minhao Li1, Weiwei Zuo1
1State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China.
一种新型的 (III) 催化剂 (C1) 能够高效地进行和的不对称化,达到高达99%的异构过量. 这种催化剂在性能上优于贵金属催化剂,并显示出实际的合成效用.
科学领域:
- 有机金属化学
- 催化剂
- 不对称的合成
背景情况:
- 非对称化 (AH) 对于合成性分子至关重要.
- 开发高效和有选择性的催化剂,特别是土壤丰富的金属催化剂,仍然是一个关键挑战.
- 催化剂已经显示出有前途,但通常需要优化高性能.
研究的目的:
- 开发和描述一种用于不对称化的新型氨基-二催化剂 (C1).
- 研究C1对于和缩的基本化学和催化活性.
- 将C1的性能与现有的贵金属和基催化剂进行比较.
主要方法:
- 使用NMR光谱学合成和描述 (III) 前催化剂 (PC1) 和活性催化剂 (C1).
- 在各种和基质的不对称化过程中对催化活性和选择性的评估.
- 动力学研究和密度函数理论 (DFT) 计算以阐明反应机制并确定循环限制步骤.
主要成果:
- 新型 (III) 催化剂C1表现出高转换频率 (高达9.9秒-1秒) 和优异的反选择性 (高达99%即位) 在温和条件下对AH进行检测.
- C1的性能明显优于贵金属 (Ru,Ir) 催化剂和其他催化剂,分别提高了66-90倍和8500倍.
- 催化剂在50克尺度上成功合成了 (R) - 伊纳化物,具有95%的电位,证明了其实际适用性. DFT的计算显示出一个低能耗障碍.
结论:
- 氨基二催化剂C1代表了不对称化催化剂的重大进步.
- 独特的转化联体和NH功能激活了催化剂,并促进了外层H2分离途径.
- C1提供了一种高效,有选择性的,可能更可持续的替代品,用于合合成的贵金属催化剂.
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