Synthesis and thermal cyclization of an enediyne-sulfonamide
摘要:
The synthesis of an enediyne sulfonamide by alkylidene carbene rearrangement is reported. The compound cyclizes thermally to give the Bergman product, which was prepared independently for comparison. Like other sigma-acceptor substituents at the enediyne alkyne termini, such as fluoride, oxonium or ammonium groups, the sulfonamide moiety enhances the reactivity for thermal Bergman cyclization as shown by the cyclization kinetic of the title compound. (C) 2003 Elsevier Ltd. All rights reserved.
Metal‐Free Hydrophosphoryloxylation of Ynamides: Rapid Access to Enol Phosphates
作者:Dalie An、Weinan Zhang、Bin Pan、Yingying Zhao
DOI:10.1002/ejoc.202001335
日期:2021.1.15
An addition reaction between phosphoric acids and ynamides was developed for the synthesis of amino‐derived enolphosphates. The protocol features metal‐free conditions, exclusive selectivity, short reaction times, and easy scale‐up. Notably, the resulting products could easily undergo Suzuki‐Miyaura cross‐coupling at room temperature.
Tf<sub>2</sub>NH-Catalyzed Formal [3 + 2] Cycloaddition of Ynamides with Dioxazoles: A Metal-Free Approach to Polysubstituted 4-Aminooxazoles
作者:Yingying Zhao、Yancheng Hu、Chunxiang Wang、Xincheng Li、Boshun Wan
DOI:10.1021/acs.joc.7b00076
日期:2017.4.7
An unprecedented Tf2NH-catalyzed formal [3 + 2] cycloaddition of ynamides with dioxazoles was developed to construct various polysubstituted 4-aminooxazoles. This approach features a metal-free catalytic bimolecular assembly of oxazole motifs, a low-cost catalyst, exceptionally mild reaction conditions, a very short reaction time, a broad substrate scope, and high efficiency. This metal-free protocol
efficient Tf2NH-catalyzed [2 + 2] cycloaddition of ynamides under mild conditions has been developed. Within short reaction times, various ynamides are transformed into the corresponding 3-aminocyclobutenones in good to excellent yields. This is the first example for the metal-free intermolecular [2 + 2] self-cycloaddition of ynamides. Meanwhile, the desired cycloaddition products can be easily transformed
AgNTf<sub>2</sub>-Catalyzed Regioselective C–H Alkenylation of <i>N,N</i>-Dialkylanilines with Ynamides
作者:Xiao-Di Nie、Zhuo-Ya Mao、Jia-Ming Guo、Chang-Mei Si、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1021/acs.joc.1c02263
日期:2022.3.4
Copper-catalyzed coupling of 1,2-dibromo-1-styrenes with sulfonamides for the preparation of ynamides
作者:Yuan Yang、Xiaoyun Zhang、Yun Liang
DOI:10.1016/j.tetlet.2012.09.092
日期:2012.11
Ynamides were prepared through an efficient copper-catalyzed coupling reaction. In the presence of copper iodide, 1,10-phenanthroline, and Cs2CO3, the coupling reaction of 1,2-dibromo-1-styrenes with sulfonamides proceeded smoothly and generated the corresponding products with excellent isolated yields. (C) 2012 Elsevier Ltd. All rights reserved.