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Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
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Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...
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第一个和第二代的整体合成的teicoplanin甘氨酸.

D L Boger1, S H Kim, Y Mori

  • 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
PubMed
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.

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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.