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不对称的 δ- 乳酸合成与单体链胺人造金属酶
Isra S Hassan1, Angeline N Ta2, Michael W Danneman1,2
1Department of Chemistry , Columbia University , New York , New York 10027 , United States.
Journal of the American Chemical Society
|March 14, 2019
概括
这项研究引入了一种新型的人工金属酶,用于非对称合成有价值的乳酸盐. 在温和条件下,设计的单体链丁Rh (III) 催化剂表现出高效率和立体控制.
科学领域:
- 催化剂
- 有机合成
- 生物技术
背景情况:
- 设计用于新化学转化的人造金属酶 (ArM) 是一个重大挑战.
- 由于其稳定性和可调节的活性位点,基于斯特雷普塔维丁的ARM为催化提供了一个有前途的平台.
研究的目的:
- 为不对称合成开发一个单质链素Rh(III) 人工金属酶.
- 为了研究设计的ArM的催化效率和立体选择性,同时进行C-H激活和 [4+2]取消反应.
主要方法:
- 嵌入Rh(III) 环丁 (Cp*) 催化剂的单体 streptavidin (mSav) 支架的构建.
- 不对称合成α,β-不和-δ-乳酸盐通过协同C-H激活和 [4+2] 取消.
- 反应产物的产量和反体过剩的表征.
主要成果:
- mSav-Rh(III) ArM使得α,β-不和-δ-乳酸盐的不对称合成,产量高达99%,反体过量高达97%.
- 在室温的水性条件下,ArM有效运行.
- 与单独的辅助因子相比,mSav-Rh催化剂的反应性显著提高 (7倍) 和立体控制.
- 在反应性方面,单体ArM的表现优于四体性Streptavidin-Rh (11-33倍).
结论:
- 开发出来的单体链胺Rh(III) ARM是一种高度有效的 δ- 乳酸盐合成催化剂.
- 这种 ARM 提供了一个可靠的平台来获取丰富的 piperidines,这是重要的制药构件.
- 这项研究强调了单体支架在人工金属酶中提高催化性能的优势.
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