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
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.
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
Gold-Catalyzed Intermolecular Nitrene Transfer from 2<i>H</i>-Azirines to Ynamides: A Direct Approach to Polysubstituted Pyrroles
作者:Lei Zhu、Yinghua Yu、Zhifeng Mao、Xueliang Huang
DOI:10.1021/ol503172h
日期:2015.1.2
An effective gold-catalyzed intermolecular nitrene transfer by the reaction of 2H-azirines and ynamides is reported, which provides highly substituted pyrroles in a straightforward manner. This transformation proceeds under mild conditions and gives the polysubstituted pyrroles in good-to-excellent yields. Preliminary results indicate that a nongold carbenoid pathway is preferred for current pyrrole synthesis.