Furans Accessed through Visible-Light-Mediated Oxidative [3+2] Cycloaddition of Enols and Alkynes
作者:Ailong Shao、Xu Luo、Chien-Wei Chiang、Meng Gao、Aiwen Lei
DOI:10.1002/chem.201704519
日期:2017.12.19
Visible‐light‐mediated formation of furans though direct oxidative [3+2] cycloaddition of 1,3‐diones and alkynes is described. This protocol provides a simple and mild route to poly‐substituted furans in moderate‐to‐good yields. Preliminary mechanistic studies suggest that this reaction likely follows a radical addition/cyclization pathway.
Synthesis of oxazole and furan derivatives <i>via</i> Rh<sub>2</sub>(OAc)<sub>4</sub>-catalyzed C≡X bond insertion of cyclic 2-diazo-1,3-diketones with nitriles and arylacetylenes
作者:Chenli Fan、Xinwei He、Yin Zuo、Yongjia Shang
DOI:10.1080/00397911.2018.1473441
日期:2018.11.2
Abstract A convenient and efficient procedure for the synthesis of 2-substituted-6,7-dihydrobenzo[d]oxazol-4(5H)-ones and 2-aryl-6,7-dihydrobenzofuran-4(5H)-ones through a Rh2(OAc)4-catalyzed C≡X (X = N, C) insertion of cyclic 2-diazo-1,3-diketones with nitriles and aromatic alkynes has been developed. This reaction uses readily available starting materials and stable cyclic 2-diazo-1,3-diketone compounds
摘要 一种通过 Rh2 合成 2-取代-6,7-二氢苯并[d]恶唑-4(5H)-酮和2-芳基-6,7-二氢苯并呋喃-4(5H)-酮的简便有效方法(OAc)4 催化的 C≡X (X = N, C) 插入环状 2-重氮-1,3-二酮与腈和芳香炔已被开发。该反应使用容易获得的起始材料和稳定的环状 2-重氮-1,3-二酮化合物,以良好至高产率形成所需产物。提出了涉及该反应的 C≡X 键插入和 1,5-偶极电环化/开环和环化序列的初步机制。图形概要
Carbenoid Type Reactions of a Stabilized Bismuthonium Ylide in the Presence of Copper Catalyst
Triphenylbismuthonio-4,4-dimethyl-2,6-dioxocyclohexan-1-ide reacts with 1-alkynes in the presence of small amounts of copper(I) chloride to form bicyclic furan derivatives probably via a carbenoid intermediate.
Oxidative Addition of 1,3-Dicarbonyl Compounds to Terminal Acetylenes Mediated by Cerium(IV) Ammonium Nitrate
作者:Ani Deepthi、Akhil Sivan、Vidya Nandialath
DOI:10.1055/s-0030-1260095
日期:2011.8
Cerium(IV) ammoniumnitrate mediated oxidative addition of 1,3-dicarbonyl compounds to terminal acetylenes to yield multisubstituted furan derivatives is reported here. The simplicity of the reaction and the ease of execution are particularly noteworthy. cerium(IV) ammoniumnitrate - oxidative addition - terminal acetylenes - multisubstituted furans - 1,3-dicarbonyl compounds