Rhodium-catalysed synthesis of fused pyrimidine derivatives employing N-sulfonyl-1,2,3-triazoles as a 1-aza-[4C] synthon
作者:Ze-Feng Xu、Yuehui An、Yidian Chen、Shengguo Duan
DOI:10.1016/j.tetlet.2019.06.023
日期:2019.7
A new synthetic application of N-sulfonyl-1,2,3-triazoles acting as a 1-aza-[4C] synthon via the 1,2-shift reaction of an α-imine rhodium carbene was developed for the synthesis of fused pyrimidine derivatives. The high reactivity of the strained three-membered 2H-azirine ring facilitated the unusual cyclization of electron-deficient dienes with electron-deficient dienophiles. The compatibility was
General Synthesis of Tri-Carbo-Substituted <i>N</i><sup>2</sup>-Aryl-1,2,3-triazoles <i>via</i> Cu-Catalyzed Annulation of Azirines with Aryldiazonium Salts
作者:Fang-Fang Feng、Jun-Kuan Li、Xuan-Yu Liu、Fa-Guang Zhang、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acs.joc.0c01433
日期:2020.8.21
The general synthesis of fully substituted N2-aryl-1,2,3-triazoles is hitherto challenging compared with that of the N1-aryl counterparts. Herein, we describe a Cu-catalyzed annulation reaction of azirines and aryldiazonium salts. This regiospecific method allows access to a broad spectrum of tri-carbo N2-aryl-1,2,3-triazoles substituted with diverse aryl and alkyl moieties. Its utility is highlighted
Ruthenium-Catalyzed [3 + 2] Cycloaddition of 2<i>H</i>-Azirines with Alkynes: Access to Polysubstituted Pyrroles
作者:Tengfei Li、Hao Yan、Xincheng Li、Chunxiang Wang、Boshun Wan
DOI:10.1021/acs.joc.6b02322
日期:2016.12.2
A ruthenium-catalyzed intermolecular [3 + 2] cycloaddition of 2H-azirines and activated alkynes is reported, which provides polysubstituted pyrroles in moderate to good yields. This approach features a C–N bond cleavage of 2H-azirines by a ruthenium catalyst. The results of this study would provide a complementary method to synthesize polysubstituted pyrroles from the known 2H-azirine approaches and
Zinc-Enabled Annulation of Trifluorodiazoethane with 2<i>H</i>-Azirines to Construct Trifluoromethyl Pyrazolines, Pyrazoles, and Pyridazines
作者:Yue-Ji Chen、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.orglett.1c02139
日期:2021.8.6
involves two [3 + 2] cycloaddition steps and one dinitrogen extrusion process in one pot, thus giving a broad array of 3-trifluoromethyl pyrazolines in good yields with excellent diastereoselectivities. Further transformations provide facile access to 3-trifluoromethyl pyrazoles and 3,5-ditrifluoromethyl pyridazines with good efficiency.
<scp>Visible‐Light‐Promoted</scp>
[3 + 2] Cycloaddition of
<scp>
2
<i>H</i>
‐Azirines
</scp>
with Quinones: Access to Substituted Benzo[
<i>f</i>
]isoindole‐4,9‐diones
作者:Lijia Wang、Chuang Liu、Lei Li、Xin Wang、Ran Sun、Ming‐Dong Zhou、He Wang
DOI:10.1002/cjoc.202100728
日期:2022.3.15
A visible-light-promoteded [3 + 2] cycloadditionreaction of 2H-azirines with quinones has been developed under mild reaction conditions. The reaction provides a general and efficient strategy for the synthesis of the benzo[f]isoindole-4,9-diones scaffold via a tandem [3 + 2] cyclization/oxidative aromatization with molecular oxygen. Furthermore, preliminary studies for photocatalytic properties show
在温和的反应条件下,已开发出一种可见光促进的 2 H-氮丙啶与醌的 [3 + 2] 环加成反应。该反应为通过分子氧的串联[3 + 2]环化/氧化芳构化合成苯并[ f ]异吲哚-4,9-二酮骨架提供了一种通用且有效的策略。此外,对光催化性能的初步研究表明,苯并[ f ]isoindole-4,9-diones 3 可用作多种有机转化的光催化剂。