Synthesis of dibenzosuberenone-based novel polycyclic π-conjugated dihydropyridazines, pyridazines and pyrroles
作者:Ramazan Koçak、Arif Daştan
DOI:10.3762/bjoc.17.61
日期:——
The synthesis of novel polycyclic π-conjugated dihydropyridazines, pyridazines, and pyrroles was studied. Dihydropyridazine dyes were synthesized by inverse electron-demand Diels–Alder cycloaddition reactions between a dibenzosuberenone and tetrazines that bear various substituents. The pyridazines were synthesized in high yields by oxidation of dihydropyridazine-appended dibenzosuberenones with PIFA
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。
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。