BF3·OEt2-mediated a one-pot tandembenzannulation of 4-alkynols 5 with oxygenated benzenes 4 affords 1-arylnaphthalenes 6 in good yields. The key synthetic route combines a facile doubleFriedel–Crafts electrophilic cyclization of 4-alkenols 5 followed by a sequential desulfonative aromatization. A plausible mechanism has been studied and proposed.
Thulium Triflate Catalyzed Hydration of 2-Substituted 4-Alkynones
作者:M.-Y. Chang、Y.-C. Cheng
DOI:10.1055/s-0035-1561652
日期:——
We report on a facile synthetic route for the preparation of substituted 1,4-diketones by thulium triflate mediated hydration of substituted 4-alkynones in MeNO 2 at 25 °C for five hours. The products were obtained in moderate to high yields.
我们报告了通过三氟甲磺酸铥介导的取代 4-炔酮在 MeNO 2 中在 25°C 下水合 5 小时制备取代 1,4-二酮的简便合成路线。以中等至高产率获得产物。
作者:Tuong Anh To、Chao Pei、Rene M. Koenigs、Thanh Vinh Nguyen
DOI:10.1002/anie.202117366
日期:2022.3.21
H-bonding network: Hexafluoroisopropanol (HFIP) can act as a hydrogen-bond donor to enhance the catalytic efficiency of simple Brønsted acid catalysts in carbonyl-olefin metathesis reactions by stabilization of all transition states and intermediates along the reaction pathway.
Ascorbic Acid Promoted Oxidative Arylation of Vinyl Arenes to 2-Aryl Acetophenones without Irradiation at Room Temperature under Aerobic Conditions
作者:Biju Majhi、Debasish Kundu、Brindaban C. Ranu
DOI:10.1021/acs.joc.5b00825
日期:2015.8.7
A convenient and general protocol for oxidative arylation of vinyl arenes by aryl radicals generated in situ from arene diazonium fluoroborates promoted by ascorbic acid in air at room temperature has been developed in the absence of any additive and visible light irradiation. A series of diversely substituted 2-aryl acetophenones have been obtained in good yields by this procedure.
In(OTf)3-mediated synthesis of substituted pyridazines
作者:Meng-Yang Chang、Yi-Ju Lu、Yu-Chieh Cheng
DOI:10.1016/j.tet.2015.07.025
日期:2015.9
In(OTf)(3) (4c)-mediated one-pot (4+2) cyclocondensation of gamma-alkynones 3 with N2H4(aq) in dioxane affords substituted pyridazines 5 in good yields via a sequential desulfonative or dehydrogenative aromatization. The facile transformation proceeds by a facile synthetic sequence starting with an alpha-propargylation of beta-ketosulfones 1 and a cyclocondensation of gamma-alkynones 3 with N2H4(aq). The method provides a mild and efficient condition. Moreover, this route can be enlarged to multigram scale. (C) 2015 Elsevier Ltd. All rights reserved.