Unified Access to Pyrimidines and Quinazolines Enabled by N-N Cleaving Carbon Atom Insertion.

Unified Access to Pyrimidines and Quinazolines Enabled by N-N Cleaving Carbon Atom Insertion.
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DOI:
10.1021/jacs.2c09616
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发表时间:
2022-10-26
影响因子:
15
通讯作者:
Levin, Mark D.
Levin, Mark D.
中科院分区:
化学1区
文献类型:
--
作者:
Hyland, Ethan E.;Kelly, Patrick Q.;McKillop, Alexander M.;Dherange, Balu D.;Levin, Mark D.

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考虑到杂环在生物活性分子中的普遍存在,具有用模块化修饰这种分子骨架的能力的转化仍然是高度期望的。在这方面,能够使特权杂环基序相互转化的环扩展特别令人感兴趣。因此,已知的扩环和缩环机制决定了适合骨架编辑的杂环类别。在此,我们报道了一个选择性地裂解吡唑和吲唑核的N-N键分别得到嘧啶和喹唑啉的反应。该氯代二氮丙啶介导的反应提供了一个统一的路线,以相关的一对杂环,否则通常通过不同的方法制备。机理实验和DFT计算支持一个途径,涉及吡唑叶立德片段,然后环化的开环的二氮杂己三烯中间体,以产生新的二嗪核心。除了能够从容易制备的起始材料获得有价值的杂芳烃之外,我们还证明了骨架编辑在合成瑞舒伐他汀类似物以及芳基载体调节直接支架跳跃中的合成效用。
Given the ubiquity of heterocycles in biologically active molecules, transformations with the capacity to modify such molecular skeletons with modularity remain highly desirable. Ring expansions that enable interconversion of privileged heterocyclic motifs are especially interesting in this regard. As such, the known mechanisms for ring expansion and contraction determine the classes of heterocycle amenable to skeletal editing. Herein, we report a reaction that selectively cleaves the N–N bond of pyrazole and indazole cores to afford pyrimidines and quinazolines, respectively. This chlorodiazirine-mediated reaction provides a unified route to a related pair of heterocycles that are otherwise typically prepared by divergent approaches. Mechanistic experiments and DFT calculations support a pathway involving pyrazolium ylide fragmentation followed by cyclization of the ring-opened diazahexatriene intermediate to yield the new diazine core. Beyond enabling access to valuable heteroarenes from easily prepared starting materials, we demonstrate the synthetic utility of skeletal editing in the synthesis of a Rosuvastatin analog as well as in an aryl vector-adjusting direct scaffold hop.
碳原子插入由叶绿素促进的吡咯和吲哚。
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