Imidazotetrazines as Weighable Diazomethane Surrogates for Esterifications and Cyclopropanations
作者:Riley L. Svec、Paul J. Hergenrother
DOI:10.1002/anie.201911896
日期:2020.1.27
Diazomethane is one of the most versatile reagents in organic synthesis, but its utility is limited by its hazardous nature. Although alternative methods exist to perform the unique chemistry of diazomethane, these suffer from diminished reactivity and/or correspondingly harsher conditions. Herein, we describe the repurposing of imidazotetrazines (such as temozolomide, TMZ, the standard of care for
Synthesis of Benzylic Alcohols by Decarboxylative Hydroxylation
作者:Qian Yu、Donglin Zhou、Yaoyue Liu、Xuejin Huang、Chunlan Song、Junjun Ma、Jiakun Li
DOI:10.1021/acs.orglett.2c03741
日期:2023.1.13
demonstrate an efficient method for the decarboxylative hydroxylation of carboxylicacids with silver(I) as the catalyst and ceriumammoniumnitrate as the oxidant and its utility in chemoselective late-stage functionalization of natural products and drug molecules. The chemoselectivity of this protocol arises from a benzylic nitrate intermediate that retards further oxidation and is hydrolyzed to the
申请人:The Board of Trustees of the University of Illinois
公开号:US10800730B2
公开(公告)日:2020-10-13
The invention provides a novel, general, and facile strategy for the creation of small molecules with high structural and stereochemical complexity. Aspects of the methods include ring system distortion reactions that are systematically applied to rapidly convert readily available natural products to structurally complex compounds with diverse molecular architectures. Through evaluation of chemical properties including fraction of sp3 carbons, ClogP, and the number of stereogenic centers, these compounds are shown to be significantly more complex and diverse than those in standard screening collections. This approach is demonstrated with natural products (gibberellic acid, adrenosterone, and quinine) from three different structural classes, and methods are described for the application of this strategy to any suitable natural product.
The concept of selenium-nitrogen exchange (SeNEx) click chemistry is put forward based on the excellent performance of the reaction between benzoselenazolones and terminal alkynes. The reaction exhibits modularity, robustness, mild reaction conditions, and fast kinetics (k2≥14.43 M−1 s−1), and its broad applicability is demonstrated with examples of on-plate nanomole-scale parallel synthesis, DNA-encoded
基于苯并硒唑啉酮与末端炔烃反应的优异性能,提出了硒氮交换(SeNEx)点击化学的概念。该反应表现出模块化、鲁棒性、反应条件温和、动力学快( k 2 ≥14.43 M -1 s -1 ),并通过板内纳摩尔级平行合成、DNA编码文库合成等实例证明了其广泛的适用性,以及肽和蛋白质修饰。
Cross et al., Journal of the Chemical Society, 1958, p. 2520,2521