Efficient Approach to 4-Sulfonamidoquinolines via Copper(I)-Catalyzed Cascade Reaction of Sulfonyl Azides with Alkynyl Imines
作者:Guolin Cheng、Xiuling Cui
DOI:10.1021/ol400219n
日期:2013.4.5
A novel and efficient approach to 4-sulfonamidoquinolines via copper-catalyzed cascade reaction of sulfonylazides with alkynyl imines has been developed in which a 1,3-dipole cycloaddition/ketenimine formation/6π-electrocyclization/[1,3]-H shift cascade reaction was involved. Various 4-sulfonamidoquinolines were afforded in up to 84% yield for 19 examples. This synthetic strategy features with atom
Preparation of 1,5-Disubstituted Tetrazoles Under Phase-Transfer Conditions
作者:T. V. Artamonova、A. B. Zhivich、M. Yu. Dubinskii、G. I. Koldobskii
DOI:10.1055/s-1996-4418
日期:1996.12
Imidoyl chlorides, obtained by common methods from a wide range of aromatic mono- and diamides, are smoothly converted to the corresponding tetrazoles in high yields by treatment with NaN3 under phase-transfer conditions.
<i>N</i>-Alkylation of α-Iminophosphonates and Application to Horner–Wadsworth–Emmons Reaction
作者:Makoto Shimizu、Masasato Tateishi、Isao Mizota
DOI:10.1246/cl.140763
日期:2014.11.5
N-Alkylation of α-iminophosphonates with Grignard reagents gives α-N-alkylaminophosphonates. A subsequent Horner–Wadsworth–Emmons reaction of the intermediary α-metalated phosphonate takes place with aldehydes to give enamines. The enamine thus prepared reacts with MVK to give a four-component coupling product.
Acylation of 2-benzylpyridine N-oxides and subsequent in situ [3,3]-sigamatropic rearrangement reaction
作者:Hua-qing Jing、Hong-liang Li、Jon C. Antilla
DOI:10.1016/j.tetlet.2020.152401
日期:2020.10
2-benzylpyridine N-oxides and their fast in situ [3,3]-sigmatropic rearrangement was reported. This transformation has a wide substrate scope under mild conditions, giving moderate to excellent yields. The application for the synthesis of chiral phenyl-2-pyridylmethanol products was briefly explored. Furthermore, an interesting example of tandem substitution and in situ [3,3]-sigamatropic rearrangement of 2-benzylpyridine
α-Imino Iridium Carbenes from Imidoyl Sulfoxonium Ylides: Application in the One-Step Synthesis of Indoles
作者:Clarice A. D. Caiuby、Matheus P. de Jesus、Antonio C. B. Burtoloso
DOI:10.1021/acs.joc.0c00833
日期:2020.6.5
Imidoyl sulfoxonium ylides are presented for the first time as potential precursors to generate α-imino metal-carbene intermediates and applied in direct C–H functionalization reactions catalyzed by [Ir(cod)Cl]2 (4 mol %) to provide 2-substituted indoles (up to 70% yield) in just one step. This class of sulfur ylide is successfully obtained from imidoyl chloride and dimethylsulfoxonium methylide (23