Highly regioselective Lewis acid-catalyzed [3+2] cycloaddition of alkynes with donor–acceptor oxiranes by selective carbon–carbon bond cleavage of epoxides
CONVERSION OF 3-ARYL-5-PHENYL-2(3H)-FURANONES INTO 3(2H)-ISOTHIAZOLONE DERIVATIVES
作者:Hamed A. Derbala、Abdel-Saitar S. Hamad、Waleed A. El Said、Ahmed I. Hashem
DOI:10.1080/10426500108040263
日期:2001.8
Abstract Upon heating 3-aryl-S-phenyl-2(3H)-furanones (la-c) with benzylamine at 100°C in the absence of solvents, ring opening occurred with the formation of the corresponding N-benzylamides (3a-c). When the latter compounds (3a-c) were allowed to react with thionyl chloride at room temperature, the corresponding isothiazolones (4a-c) were obtained. Treatment of the isothiazolones (4a-c) with sodium
Palladium-Catalyzed Difluorocarbene Transfer Enabled Divergent Synthesis of γ-Butenolides and Ynones from Iodobenzene and Terminal Alkynes
作者:Heyun Sheng、Zhiwei Chen、Qiuling Song
DOI:10.1021/jacs.3c13044
日期:2024.1.17
Herein, we report a ligand-controlled palladium-catalyzed method that enables the synthesis of ynones and γ-butenolides with excellent regioselectivity from the same set of readily available aryl iodides, aryl acetylenes, and BrCF2CO2K. In this reaction, the [PdII]═CF2 does demonstrate electrophilicity and can generate CO readily when reacting with H2O. It is environmentally friendly and safe compared
在此,我们报道了一种配体控制的钯催化方法,该方法能够从同一组容易获得的芳基碘化物、芳基乙炔和 BrCF 2 CO 2 K 合成具有优异区域选择性的炔酮和 γ-丁烯内酯。在该反应中, [Pd II ]=CF 2确实表现出亲电性,与 H 2 O 反应时很容易生成 CO。与传统方法相比,它对环境友好且安全,并且当前的方案使我们能够以高产率提供炔酮和 γ-丁烯内酯出色的功能容差。此外,利用该策略还可以与相应的酚和醇获得酯。生物活性化合物后期功能化的成功进一步说明了该方案在材料开发和药物发现中的合成效用。
Photophysics of furanoxy radicals. Fluorescence and triplet-doublet energy transfer
作者:K. Bhattacharyya、P. K. Das、R. W. Fessenden、M. V. George、K. R. Gopidas、G. L. Hug
DOI:10.1021/j100266a002
日期:1985.9
Regioselective Pd-catalyzed alkylative lactonizations of 4-hydroxy-2-alkynecarboxylates with organoboronic acids
作者:Chang Ho Oh、Su Jin Park、Jin Hyang Ryu、Arun Kumar Gupta
DOI:10.1016/j.tetlet.2004.07.129
日期:2004.9
The palladium-catalyzed addition of aryl- and alkenylboronic acids to 4-hydroxy-2-alkynecarboxylates and in situ lactonization would constitute a novel methodology for the synthesis of various butenolides with an excellent stereoselectivity and a high control of regioselectivity. (C) 2004 Published by Elsevier Ltd.
Photoinduced electron-transfer reactions of 2(3H)-furanones and bis(benzofuranones). Spectral and kinetic behavior of radicals and radical cations
作者:H. F. Davis、B. B. Lohray、K. R. Gopidas、C. V. Kumar、P. K. Das、M. V. George