4-Tetrahydrophthalazin-1-one and 1,2,3,4-tetrahydrophthalazin-1,4-dione derivatives were synthesised in high (up to 85%) and low yields using 2-iodobenzyl bromide and 1,2-diiodobenzene as bifunctional substrates, respectively. Iodoarenes, carbon monoxide and various hydrazine derivatives as N-nucleophiles were used in a three-component palladium-catalysed cascade hydrazinocarbonylation. A similar palladium-catalysed
Rate constants for 1,n-hydrogen transfer reactions in some amino acid derived radicals
作者:Le Zeng、Talbi Kaoudi、Carl H. Schiesser
DOI:10.1016/j.tetlet.2006.09.010
日期:2006.11
Absolute rateconstants for 1,n-hydrogen atom transfers in some substituted amino acid derivedradicals have been determined in benzene through the use of competitive kinetic experiments. Radicalsderivedfrom methyl N-(2-iodobenzoyl)-N-(tert-butyloxycarbonyl)glycinate, -alaninate, -leucinate, -tert-leucinate and -phenylglycinate undergo intramolecular 1,5-hydrogen atom transfer to afford the corresponding
通过使用竞争动力学实验,已经确定了苯中某些取代的氨基酸衍生基团中n氢原子转移的1的绝对速率常数。由N-(2-碘苯甲酰基)-N-(叔丁氧基羰基)甘氨酸甲酯,-丙氨酸酯,-亮氨酸酯,-叔亮氨酸酯和-苯基甘氨酸酯衍生的自由基经历分子内的1,5-氢原子转移以提供相应的α-氨基在80°C时速率常数在1.0-4.3×10 7 s -1范围内的酸酯基。如果氨基酸侧链中存在可抽象的氢原子,则1,6-和1,7-易位是竞争过程。
Assembly and Disassembly of Supramolecular Hypervalent Iodine Macrocycles via Anion Coordination
作者:Krishna Pandey、Samsul Arafin、Eli Jones、Yachu Du、Gajanan C. Kulkarni、Ain Uddin、Toby J. Woods、Kyle N. Plunkett
DOI:10.1021/acs.joc.3c02830
日期:2024.6.7
This study explores the dynamic self-assembly and disassembly of hypervalent iodine-based macrocycles (HIMs) guided by secondary bonding interactions. The reversible disassembly and reassembly of HIMs are facilitated through anion binding via the addition of tetrabutylammonium (TBA) salts or removal of the anion by the addition of silver nitrate. The association constants for HIM monomers with TBA(Cl)
本研究探索了由二次键合相互作用引导的高价碘基大环化合物(HIM)的动态自组装和分解。通过添加四丁基铵 (TBA) 盐进行阴离子结合或通过添加硝酸银去除阴离子,促进 HIM 的可逆分解和重新组装。计算了 HIM 单体与 TBA(Cl) 和 TBA(Br) 的缔合常数,并显示了与碘阴离子键强度的相关性。一种独特的四配位高价碘基化合物被鉴定为分解的单体。最后,该研究揭示了这些大环化合物在溶液中的动态键合性质,允许重排和参与动态键合化学。
Synthesis of Fused Isoquinolinone and Iminoisoindolinone Derivatives<i>via</i>a Copper-Catalyzed Regioselective Switching Process
AbstractCopper‐catalyzed base switching procedures for the synthesis of various fused isoquinolinone derivatives and iminoisoindolinone derivatives from the same starting materials have been developed. In these reaction sequences it is found that benzyl cyanide acts as a nucleophile in the presence of strong bases while it acts as a cyanide donor in the presence of weak bases. A wide substrate scope, good functional group tolerance, and handy reaction conditions are the important features of these protocols. Futhermore, using these protocols a wide variety of imidazolone‐fused isoquinolinone derivatives, pyrimidinone‐fused isoquinolinone derivatives, a diazapinone‐fused isoquinolinone derivative and iminoisoindolinone derivatives were accessed in excellent to moderate yields.magnified image
Structure‐Activity Studies Reveal Scope for Optimisation of Ebselen‐Type Inhibition of SARS‐CoV‐2 Main Protease
作者:Siegfried T. D. Thun‐Hohenstein、Timothy F. Suits、Tika R. Malla、Anthony Tumber、Lennart Brewitz、Hani Choudhry、Eidarus Salah、Christopher J. Schofield
DOI:10.1002/cmdc.202100582
日期:2022.2.16
AbstractThe reactive organoselenium compound ebselen is being investigated for treatment of coronavirus disease 2019 (COVID‐19) and other diseases. We report structure‐activity studies on sulfur analogues of ebselen with the Severe Acute Respiratory Syndrome coronavirus 2 (SARS‐CoV‐2) main protease (Mpro), employing turnover and protein‐observed mass spectrometry‐based assays. The results reveal scope for optimisation of ebselen/ebselen derivative‐ mediated inhibition of Mpro, particularly with respect to improved selectivity.