Copper-mediated trifluoromethylation of potassium alkynyltrifluoroborates with Langlois' reagent
摘要:
Synthesis of trifluoromethylated acetylenes by copper-mediated trifluoromethylation of potassium alkynyltrifluoroborates with CF3 radicals generated from NaSO2CF3 and tert-butyl hydroperoxide (TBHP) is communicated. The trifluoromethylated acetylenes were obtained in good to moderate yields. The presented method tolerates a wide range of aromatic, heteroaromatic, and aliphatic potassium alkynyltrifluoroborates. (C) 2014 Elsevier Ltd. All rights reserved.
Tosyloxybenziodoxolone: A Platform for Performing the Umpolung of Alkynes in One-Pot Transformations
作者:Julien Borrel、Jerome Waser
DOI:10.1021/acs.orglett.1c03771
日期:2022.1.14
Ethynylbenziodoxolones (EBXs) are commonly encountered reagents for the electrophilic alkynylation of nucleophiles. Herein, we report a one-pot, two-step process for EBX generation and their direct application in substrate functionalization. Our approach enables us to bypass the originally mandatory isolation and purification of the reagents, resulting in a more efficient synthesis. We could apply
作者:Kathleen Stout、Theo P. J. Peters、Mathijs F. J. Mabesoone、Fabian L. L. Visschers、Eline M. Meijer、Joëlle‐Rose Klop、Jeroen Berg、Paul B. White、Alan E. Rowan、Roeland J. M. Nolte、Johannes A. A. W. Elemans
DOI:10.1002/ejoc.202001211
日期:2020.12.7
The synthesis and characterization of double porphyrin cage compounds are described. They consist of twoporphyrins that are each attached to a diphenylglycoluril‐based clip molecule via four ethyleneoxy spacers, and are linked together by a single alkyl chain using “click”‐chemistry. Following a newly developed multistep synthesis procedure we report three of these double porphyrin cages, linked by
Organocatalytic Enantioselective Conjugate Alkynylation of β-Aminoenones: Access to Chiral β-Alkynyl-β-Amino Carbonyl Derivatives
作者:Jian-Fei Wang、Xin Meng、Chao-Huan Zhang、Chuan-Ming Yu、Bin Mao
DOI:10.1021/acs.orglett.0c02394
日期:2020.10.2
Readily available potassium alkynyltrifluoroborates were used for organocatalytic asymmetric conjugate alkynylation of beta-enaminones. The interception of a modified binaphthol catalyst and in situ generated organodifluoroboranes proved important to access functionalized beta-alkynyl-beta-amino carbonyls and derivatives with improved chemo-reactivity and enantio-induction. Mechanistic studies revealed the impact of molecular sieves on efficiency and stereocontrol. The products undergo additional functionalization to yield a diverse set of valuable beta-alkynyl-beta-amino carbonyl scaffolds.