Synthesis of benzoxazoles <i>via</i> the copper-catalyzed hydroamination of alkynones with 2-aminophenols
作者:Kohei Oshimoto、Hiroaki Tsuji、Motoi Kawatsura
DOI:10.1039/c9ob00572b
日期:——
describe herein the synthetic method to benzoxazole derivatives via the copper-catalyzed hydroamination of alkynones with 2-aminophenols. The method produced a wide variety of functionalized benzoxazole derivatives in good yields. Preliminary mechanistic experiments revealed that the reaction would proceed through the copper-catalyzed hydroamination of alkynones and the sequential intramolecular cyclization
Rhodium-Catalyzed/Copper-Mediated Tandem C(sp<sup>2</sup>)–H Alkynylation and Annulation: Synthesis of 11-Acylated Imidazo[1,2-<i>a</i>:3,4-<i>a</i>′]dipyridin-5-ium-4-olates from 2<i>H</i>-[1,2′-Bipyridin]-2-ones and Propargyl Alcohols
作者:Ting Li、Zhiqiang Wang、Kun Xu、Wenmin Liu、Xu Zhang、Wutao Mao、Yongming Guo、Xiaolin Ge、Fei Pan
DOI:10.1021/acs.orglett.6b00177
日期:2016.3.4
A rhodium-catalyzed/copper-mediated tandem C(sp2)–H alkynylation and intramolecular annulation of 2H-[1,2′-bipyridin]-2-ones with propargyl alcohols for the synthesis of 11-acylated imidazo[1,2-a:3,4-a′]dipyridin-5-ium-4-olates is described.
铑催化/铜介导的串联C(sp 2)-H炔基化反应和2 H- [1,2'-联吡啶] -2-酮与炔丙醇的分子内环化反应,合成11-酰化的咪唑[1,描述了2- a:3,4- a ']双吡啶-5-鎓-4-油酸酯。
TMSCl-Mediated Synthesis of α,β-Unsaturated Amides via C–C Bond Cleavage and C–N Bond Formation of Propargyl Alcohols with Trimethylsilyl Azide
method with high efficiency for the synthesis of α,β-unsaturated amides from the easily prepared propargyl alcohols and TMSN3 using TMSCl as an acid promoter is developed. A wide variety of α,β-unsaturated amides were produced in moderate to excellent yields. Mechanistic studies indicate that this transformation involves TMSCl-mediated allenylazide intermediate formation, C–C bond cleavage, and C–N
Transition-metal-free C–C σ-bond activation of α-aryl ketones and subsequent Zn-catalyzed intramolecular cyclization: synthesis of tetrasubstituted furans
作者:Yang Yuan、Hailu Tan、Lingkai Kong、Zhong Zheng、Murong Xu、Jiaqi Huang、Yanzhong Li
DOI:10.1039/c9ob00081j
日期:——
atom-economical protocol for the synthesis of tetrasubstituted furans has been developed. This process is realized through the tandem reactions of Cs2CO3 promoted C–C σ-bond activation of α-aryl ketones followed by Zn-catalyzed intramolecular cyclization. This represents the first example for the preparation of tetrasubstituted furans through rearrangement of molecular skeletons and subsequent transformations
已经开发了用于合成四取代呋喃的高度原子经济的方案。该过程是通过Cs 2 CO 3促进α-芳基酮的C–Cσ键活化,然后进行Zn催化的分子内环化的串联反应来实现的。这代表了通过分子骨架的重排和随后的转化制备四取代呋喃的第一个实例。温和的反应条件和易于获得的起始原料使该方案在有机合成中具有吸引力。
One-Pot Synthesis of 2,4-Diacyl Thiophenes from α-Oxo Ketene Dithioacetals and Propargylic Alcohols
作者:Jian Xue、Li-Gang Bai、Liang Zhang、Yue Zhou、Xiao-Long Lin、Neng-Jie Mou、Dong-Rong Xiao、Qun-Li Luo
DOI:10.1021/acs.joc.0c01093
日期:2020.8.7
Although thiophenes having various functionalities are the basic structural units in numerous bioactive compounds and optoelectronic materials, synthetic routes to acylated thiophenes from aliphatic sulfur-containing starting materials are still rare. In particular, there have been no reports concerning the straightforward synthesis of 2,4-diacylthiophenes from alkynes. Herein, we describe a highly