One‐Pot and Two‐Chamber Methodologies for Using Acetylene Surrogates in the Synthesis of Pyridazines and Their D‐Labeled Derivatives
作者:Maria S. Ledovskaya、Mikhail V. Polynski、Valentine P. Ananikov
DOI:10.1002/asia.202100562
日期:2021.8.16
Acetylene surrogates are efficient tools in modern organic chemistry with largely unexplored potential in the construction of heterocyclic cores. Two novel synthetic paths to 3,6-disubstituted pyridazines were proposed using readily available acetylene surrogates through flexible C2 unit installation procedures in a common reaction space mode (one-pot) and distributed reaction space mode (two-chamber):
乙炔替代物是现代有机化学中的有效工具,在构建杂环核方面具有很大的潜力。在常见的反应空间模式(一锅)和分布式反应空间模式(两室)中,通过灵活的 C 2单元安装程序,提出了使用现成的乙炔替代物制备 3,6-二取代哒嗪的两种新型合成途径: (1) 1,2,4,5-四嗪及其受体官能化衍生物与 CaC 2 -H 2的相互作用在两室反应器中进行的 O 混合导致相应的哒嗪定量收率;(2) 1,2,4,5-四嗪与苄基乙烯基醚的[4+2]环加成可被认为是合成多种哒嗪的通用途径。在开发的程序中用 D 2 O 和乙烯基醚及其三氘代类似物代替水,首次合成了一系列 95-99% 氘化度的 4,5-双氘代哒嗪。量子化学建模允许量化两种合成途径中的取代效应。
COPPER-CATALYZED C-H BOND ARYLATION
申请人:Daugulis Olafs
公开号:US20090076266A1
公开(公告)日:2009-03-19
The present invention is a one-step method for efficiently converting carbon-hydrogen bonds into carbon-carbon bonds using a combination of aryl halides, a substrate, and a copper salt as catalyst. This method allows faster introduction of complex molecular entities, a process that would otherwise require many more steps. This invention is particularly relevant for the organic synthesis of complex molecules such as, but not limited to, pharmacophores and explosives.
Cycloaddition Reactions of
<i>in situ</i>
Generated C
<sub>2</sub>
D
<sub>2</sub>
in Dioxane: Efficient Synthetic Approach to D
<sub>2</sub>
‐Labeled Nitrogen Heterocycles
作者:Vladimir V. Voronin、Maria S. Ledovskaya、Konstantin S. Rodygin、Valentine P. Ananikov
DOI:10.1002/ejoc.202101085
日期:2021.11.8
Efficient synthetic procedures for the preparation of D2-labeled nitrogen heterocycles via cycloaddition reactions of dideuteroacetylene in 1,4-dioxane were developed. The proposed approach is suitable for the synthesis of four classes of D2-labeled heterocycles including triazoles, isoxazoles, pyrazoles and pyridazines.
开发了通过双丁二炔在 1,4-二恶烷中的环加成反应制备 D 2标记的氮杂环的有效合成方法。所提出的方法适用于合成四类 D 2标记的杂环,包括三唑、异恶唑、吡唑和哒嗪。
A General Method for Copper-Catalyzed Arylation of Arene C−H Bonds
作者:Hien-Quang Do、Rana M. Kashif Khan、Olafs Daugulis
DOI:10.1021/ja805688p
日期:2008.11.12
A generalmethod for copper-catalyzedarylation of sp (2) C-Hbonds with p K a's below 35 has been developed. The method employs aryl halide as the coupling partner, lithium alkoxide or K 3PO 4 base, and DMF, DMPU, or mixed DMF/xylenes solvent. A variety of electron-rich and electron-poor heterocycles such as azoles, caffeine, thiophenes, benzofuran, pyridine oxides, pyridazine, and pyrimidine can
Steric and electronic effects on the
<sup>1</sup>
H hyperpolarisation of substituted pyridazines by signal amplification by reversible exchange
作者:Peter J. Rayner、Michael J. Burns、Elizabeth J. Fear、Simon B. Duckett
DOI:10.1002/mrc.5152
日期:2021.12
rapid and cost-effective hyperpolarisation of substituted pyridazines. The 33 substrates investigated cover a range of steric and electronic properties and their capacity to perform highly effective SABRE is assessed. We find the method to be tolerant to a broad range of electron donating and withdrawing groups; however, good sensitivity is evident when steric bulk is added to the 3- and 6-positions of