第一个和第二代的整体合成的teicoplanin甘氨酸
1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
Journal of the American Chemical Society
|July 18, 2001
概括
研究人员开发了一种更高效的整体合成,用于teicoplanin aglycon,一个关键的抗生素成分. 这种改进的方法涉及到环闭序的战略性变化,增强了这种复杂分子的立体选择性和整体产量.
科学领域:
- 有机化学 有机化学
- 药用化学 医学化学
- 合成化学 合成化学
背景情况:
- 泰科普拉宁是复杂的糖抗生素核心结构.
- 这种复杂分子的总合成在立体控制和效率方面提出了重大挑战.
- 以前的合成路线需要许多步骤,总产量中等.
研究的目的:
- 详细介绍第一代泰科普拉宁酸甘的总合成.
- 为了呈现第二代,改进的总合成策略.
- 为了提高teicoplanin aglycon合成中的效率,收性和 diastereoselectivity.
主要方法:
- 第一代合成涉及将EFG三与ABCD环系统合,随后进行了顺序的DE和FG宏循环化.
- 第二代合成改变了顺序,在DE宏循环和结合之前进行FG宏分离.
- 关键反应包括氧核酸芳香替代二甲基乙烯的形成和宏酸化.
主要成果:
- 第一代合成需要26个步骤,总产量为1%.
- 第二代合成在22个步骤中实现了2%的总产量.
- 经过修订后的FG宏分离 (95%),然后再进行DE宏循环,自然的亚特罗皮索马产生了>10:1二选择 (76%).
结论:
- 第二代Teicoplanin Aglycon的总合成时间显著更短,更趋同,并且具有高度的分类选择性.
- 改变宏循环化步骤的顺序对于提高效率和立体化学结果至关重要.
- 这种优化的合成提供了更容易进入teicoplanin aglycon核心结构的途径.
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