2-(2-吡啶基)氮丙啶-2-羧酸酯和硫酯中的三元环可以在铜(II)催化下选择性裂解N-C2键或在HCl作用下选择性裂解C-C键,分别提供吡唑并[1,5- a ]吡啶或咪唑并[1,5- a ]吡啶系列的异构氮丙啶扩环产物。形成吡唑并吡啶的温和催化反应条件使得可以通过一锅、三阶段程序直接从4-溴异恶唑获得它们,而无需分离中间体2-溴氮丙啶和2-(2-吡啶基)氮丙啶。
Highly strained 2H‐azirines with a tetrasubstituted stereocenter were synthesized by the enantioselective isomerization of isoxazoles with a chiral diene–rhodium catalyst system. The effect of ligands and the coordination behavior support the proposed catalytic cycle in which the coordination site is fixed in favor of efficient enantiodiscrimination by a bulky substituent of the ligand. In silico studies
A novel strategy for the synthesis of thermally stable and apoptosis-inducing 2,3-dihydroazetes
作者:Ilia A. Smetanin、Mikhail S. Novikov、Anastasiya V. Agafonova、Nikolai V. Rostovskii、Alexander F. Khlebnikov、Igor V. Kudryavtsev、Maxim A. Terpilowski、Maria K. Serebriakova、Andrey S. Trulioff、Nikolay V. Goncharov
DOI:10.1039/c6ob00588h
日期:——
A general and concise approach to thermally and hydrolytically stable alkyl 2,3-dihydroazete-2,3-di-/2,2,3-tricarboxylates from alkyl 2-bromoazirine-2-carboxylates or 4-bromo-5-alkoxyisoxazoles is reported. The synthesis involves the formation of 2-azabuta-1,3-diene by the reaction of rhodium carbenoid with isoxazole or azirine followed by cyclization/hydrodebromination cascade. The latter reaction
Easy Access to 2-Fluoro- and 2-Iodo-2H-azirines via the Halex Reaction
作者:Anastasiya V. Agafonova、Ilia A. Smetanin、Nikolai V. Rostovskii、Alexander F. Khlebnikov、Mikhail S. Novikov
DOI:10.1055/s-0039-1690200
日期:2019.12
A simple gram-scale method for the preparation of esters and dialkylamides of 2-(fluoro/iodo)-2H-azirine-2-carboxylic acids via the halogenexchange (Halex) reaction of 2-bromo-substituted analogues is reported. The method operates with inexpensive and safe reagents, Bu4NF and potassium iodide, providing high product yields. Alternatively, 2-fluoro-2H-azirine-2-carboxylates can be prepared from 2-iodo-
[2 + 1 + 1] Assembly of spiro β-lactams by Rh(<scp>ii</scp>)-catalyzed reaction of diazocarbonyl compounds with azirines/isoxazoles
作者:Artem A. Golubev、Ilia A. Smetanin、Anastasiya V. Agafonova、Nikolai V. Rostovskii、Alexander F. Khlebnikov、Galina L. Starova、Mikhail S. Novikov
DOI:10.1039/c9ob01301f
日期:——
A domino synthesis of dispiro-fused N-vinyl β-lactams from diazo-Meldrum's acid and 2H-azirines or 5-alkoxyisoxazoles via the "2-azabuta-1,3-diene formation/Staudinger ketene-imine cycloaddition" sequence is described. The Rh2(Piv)4-catalyzed formation of the 2-azabuta-1,3-diene intermediates in the first stage of the reaction sequence proceeds via addition of the rhodium carbenoid to the azirines/isoxazoles
Trading Symmetry for Stereoinduction in Tetradentate, non‐<i>C</i><sub>2</sub>‐Symmetric Fe(II)‐Complexes for Asymmetric Catalysis
作者:Philipp S. Steinlandt、Marcel Hemming、Xiulan Xie、Sergei I. Ivlev、Eric Meggers
DOI:10.1002/chem.202300267
日期:2023.6.7
A series of C1-symmetric bench-stable stereogenic-at-iron complexes comprising a linear, tetradentate ligand scaffold are introduced. The possibility of lowering the overall symmetry is scrutinized for an enantioselective ring-contraction of isoxazoles to furnish chiral 2H-azirines under open-flask conditions with the products serving as useful building blocks to access α-disubstituted α-amino acid
介绍了一系列包含线性四齿配体支架的 C 1对称稳定型铁立体异构复合物。降低整体对称性的可能性被仔细检查异恶唑的对映选择性缩环以在开放烧瓶条件下提供手性 2 H-氮杂环丙烷,产物用作获得 α-二取代的 α-氨基酸衍生物的有用构建单元。