Neighboring Carbonyl Group Assisted Hydration of Unsymmetrical Aryl Alkynes Overriding Regular Selectivity
作者:Kishor L. Mendhekar、Tapas R. Pradhan、N. Arjunreddy Mallampudi、Debendra K. Mohapatra
DOI:10.1002/ejoc.201900941
日期:2019.9.8
A mild and highly regioselective gold‐catalyzed hydration of γ‐acetoxy aryl alkynes leading to anti‐Markovnikov products by the assistance of a neighboringcarbonylgroup is presented.
Metal-Free Aminothiation of Alkynes: Three-Component Tandem Annulation toward Indolizine Thiones from 2-Alkylpyridines, Ynals, and Elemental Sulfur
作者:Zhengwang Chen、Pei Liang、Fan Xu、Zhen Deng、Lipeng Long、Guotian Luo、Min Ye
DOI:10.1021/acs.joc.9b01802
日期:2019.10.4
A metal-free three-component annulation reaction for the synthesis of indolizine thiones via tandem C-C/C-N/C-S bondformation was developed. Various 2-alkylpyridines with aromatic ynals and elemental sulfur proceeded smoothly under catalyst-free conditions, and the desired products were obtained in moderate to excellent yields.
Heterocyclic compounds and their preparation and use
申请人:——
公开号:US20020115697A1
公开(公告)日:2002-08-22
The present invention relates to therapeutically active azabicyclic compounds, a method of preparing the same and to pharmaceutical or veterinary compositions comprising the compounds. The novel compounds are useful in treating a disease in the central nervous system caused by malfunctioning of the muscarinic cholinergic system.
Copper‐Catalysed Synthesis of Propargyl Alcohol and Derivatives from Acetylene and other Terminal Alkynes
作者:Nikolai A. Sitte、Francesca Ghiringhelli、Grigory A. Shevchenko、Frank Rominger、A. Stephen K. Hashmi、Thomas Schaub
DOI:10.1002/adsc.202200369
日期:2022.7.5
reported. Using acetylene at atmospheric pressure, the catalyst consisting of <1 mol% copper(I) phenylacetylide and a trialkyl bisphosphine ligand shows a high selectivity towards the formation of propargylalcohol rather than 1,4-butynediol, which is not reported for common heterogeneous copper acetylide catalysts. The biphasic water/toluene reaction mixture allows the separation of targeted products with
Catalyst-Free Annulation of 2-Pyridylacetates and Ynals with Molecular Oxygen: An Access to 3-Acylated Indolizines
作者:Zhengwang Chen、Pei Liang、Xiaoyue Ma、Haiqing Luo、Guohai Xu、Tanggao Liu、Xiaowei Wen、Jing Zheng、Hui Ye
DOI:10.1021/acs.joc.8b02883
日期:2019.2.1
A catalyst and additive-free annulation of 2-pyridylacetates and ynals under molecular oxygen was the first developed, affording 3-acylated indolizines in good to excellent yields. Molecular oxygen was used as the source of the carbonyl oxygen atom in indolizines. This approach was compatible with a wide range of functional groups, and especially it has been successfully extended to unsaturated double bonds and triple bonds, which were difficult to prepare by previous methods in a single step.