A Robust Platform for the Synthesis of New Tetracycline Antibiotics
作者:Cuixiang Sun、Qiu Wang、Jason D. Brubaker、Peter M. Wright、Christian D. Lerner、Kevin Noson、Mark Charest、Dionicio R. Siegel、Yi-Ming Wang、Andrew G. Myers
DOI:10.1021/ja806629e
日期:2008.12.31
lithium-halogen exchange of a benzylic bromide D-ring precursor in the presence of 1 or 2, followed by warming. The AB plus D strategy for tetracycline synthesis by C-ring construction is shown to be robust across a range of different carbocyclic and heterocyclic D-ring precursors, proceeding reliably and with a high degree of stereochemicalcontrol. Evidence suggests that Michael addition of the benzylic
四环素和四环素类似物是通过 AB 前体 1 或 2 与具有广泛结构可变性的 D 环前体的收敛、一步迈克尔-克莱森缩合反应制备的,然后去除保护基团(通常分两步)。多个示例中说明了关键 C 环形成反应的许多程序变体。这些包括 D 环前体的逐步去质子化,然后添加 1 或 2,D 环前体与 1 或 2 的混合物的原位去质子化,以及苄基溴 D 环前体的原位锂 - 卤素交换1 或 2 的存在,其次是升温。通过 C 环构建合成四环素的 AB 加 D 策略在一系列不同的碳环和杂环 D 环前体中表现出稳健,可靠地进行,并具有高度的立体化学控制。有证据表明,来自给定 D 环前体的苄基阴离子在 -78 摄氏度时与烯酮 1 或 2 的迈克尔加成非常快,而所产生的烯醇化物的克莱森环化是速率决定性的,通常在升温至 0 度时发生C. AB 加 D 偶联策略也被证明可用于构建四环素前体,这些前体可通过后期转化多样化,随后环化形成
Synthesis of tetracyclines and analogues thereof
申请人:President and Fellows of Harvard College
公开号:US10669244B2
公开(公告)日:2020-06-02
The tetracycline class of antibiotics has played a major role in the treatment of infectious diseases for the past 50 years. However, the increased use of the tetracyclines in human and veterinary medicine has led to resistance among many organisms previously susceptible to tetracycline antibiotics. The modular synthesis of tetracyclines and tetracycline analogs described provides an efficient and enantioselective route to a variety of tetracycline analogs and polycyclines previously inaccessible via earlier tetracycline syntheses and semi-synthetic methods. These analogs may be used as anti-microbial agents or anti-proliferative agents in the treatment of diseases of humans or other animals.