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。
Radical-initiated diazo-retaining nucleophilic addition reaction of trifluorodiazoethane and diazoacetate with 2H‑azirines
作者:Yue-Ji Chen、Jie Zheng、Jun-An Ma、Fa-Guang Zhang
DOI:10.1016/j.jfluchem.2023.110129
日期:2023.5
A diethylzinc-air system is established to enable an unconventional diazo-retaining nucleophilic addition reaction of trifluorodiazoethane and diazoacetate with 2H-azirines. This transformation converted a broad range of cyclic 2H-azirines to valuable acyclic α-diazo amines in good yields. Further synthetic transformations provide access to β-CF3 amines, β-CF3-enamines, and CF3-oxazolines. Preliminary