Nickel-catalyzed Conjugate Addition of Arylboron Reagents to α,β-Unsaturated Carbonyl Compounds with the Aid of a Catalytic Amount of an Alkyne
作者:Eiji Shirakawa、Yuichi Yasuhara、Tamio Hayashi
DOI:10.1246/cl.2006.768
日期:2006.7
Alkynes in combination with a catalytic amount of a nickel complex were found to catalyze the conjugate addition of arylboron reagents to α,β-unsaturated carbonyl compounds, where use of an optical...
Lewis Acid Mediated “<i>endo-dig</i>” Hydroalkoxylation–Reduction on Internal Alkynols for the Stereoselective Synthesis of Cyclic Ethers and 1,4-Oxazepanes
作者:Santosh J. Gharpure、Dharmendra S. Vishwakarma、Santosh K. Nanda
DOI:10.1021/acs.orglett.7b03241
日期:2017.12.15
Lewisacidmediated 5/6/7-endo-dig hydroalkoxylation–reduction cascade on internal alkynols gave an expedient, stereoselective synthesis of cyclic ethers and 1,4-oxazepanes. The strategy has been extended to the first examples of hydroalkoxylation–alkyne Prins-type cyclization cascade of alkyne-tethered alkynols, giving access to oxa-bicyclic scaffolds. This method was used as the key step in the stereoselective
Synthesis of Azepine Derivatives by Silver-Catalyzed [5+2] Cycloaddition of<i>γ</i>-Amino Ketones with Alkynes
作者:Ming-Bo Zhou、Ren-Jie Song、Cheng-Yong Wang、Jin-Heng Li
DOI:10.1002/anie.201304902
日期:2013.10.4
Silver forges the ring: A new and practical silver‐catalyzed [5+2] cycloaddition method has been developed for the synthesis of azepines through the formation of four new chemical bonds between a γ‐amino ketone and an alkyne in one step. This method provides a new hetero‐[5+2] cycloaddition strategy for the construction of seven‐membered ring systems.
The Role of Bronsted and Lewis Acidity in the Green Synthesis of Homopropargyl Alcohols over HZSM-5
作者:Balaga Viswanadham、Sooboo Singh、Holger B. Friedrich、Abdul S. Mahomed
DOI:10.17159/0379-4350/2018/v71a8
日期:——
catalysts to compare reactivity and the influence of the type of acidity involved in the reaction. The results indicate that the presence of both Bronsted and Lewisacidity is beneficial for inducing a high rate of reaction when compared to systems having either predominantly Bronsted or Lewisacidity. Keywords: Homopropargyl, zeolites, HZSM-5
对于使用HZSM-5作为催化剂合成高炔丙醇的生物学和药学活性分子,显示了在异常温和条件下的高效简单反应。通过IR,1 H NMR,13 C NMR和GC-MS分析的产物显示出98%的醇的一致产率,即使具有再生催化剂的相应循环。该反应还用选定的无机酸,酸性氧化物和其他酸性催化剂进行,以比较反应性和反应所涉及的酸度类型的影响。结果表明,与主要具有布朗斯台德酸或路易斯酸的体系相比,布朗斯台德酸和路易斯酸的存在均有利于诱导高反应速率。关键字:炔丙基,沸石,HZSM-5
10.1021/acs.joc.4c01018
作者:Kurihara, Miari、Shigehisa, Hiroki
DOI:10.1021/acs.joc.4c01018
日期:——
This paper reports the halocyclization of alkynoic thioesters, as S-nucleophiles, with N-halosuccinimide, followed by oxidativearomatization with the same reagent for the one-pot synthesis of thiophenes, important heterocycles exhibiting remarkable applications in different disciplines. Brief mechanistic studies were also performed to elucidate the halocyclization process. The potential diverse applications