Pd-Catalyzed Selective Carbonylative and Non-carbonylative Couplings of Propiolic Acid: One-Pot Synthesis of Diarylalkynones
作者:Wonyoung Kim、Kyungho Park、Ahbyeol Park、Juseok Choe、Sunwoo Lee
DOI:10.1021/ol4004349
日期:2013.4.5
Diarylalkynones were synthesized from one-potPd-catalyzedcarbonylative and noncarbonylative coupling reactions of propiolicacid with aryl iodides under a carbon monoxide atmosphere. Aryl iodide (2.0 equiv), propiolicacid (1.0 equiv), Pd(PPh3)2Cl2 (5 mol %), CuCl (10 mol %), Et3N (6.0 equiv), and CO (8 atm) were reacted under optimized conditions in CH3CN at 80 °C for 1 h. This process afforded
A general two-step one-pot synthesis process of ynones from α-keto acids and 1-iodoalkynes
作者:Xiaobao Zeng、Chulong Liu、Weiguang Yang、Xingyong Wang、Xinyan Wang、Yuefei Hu
DOI:10.1039/c8cc05429k
日期:——
A general two-step one-pot synthesis process of ynones was developed by cycloaddition of α-keto acids and 1-iodoalkynes followed by a ring-opening reaction. Its easy conditions and novel mechanism endowed it with two distinctive advantages: iodine-atom bonded to C(sp2) remained intact and α-keto acids became a part of the triple bonds in ynones.
Sequential palladium catalyzed coupling–cyclocondensation–coupling (C<sup>3</sup>) four-component synthesis of intensively blue luminescent biarylsubstituted pyrazoles
作者:Melanie Denißen、Jan Nordmann、Julian Dziambor、Bernhard Mayer、Walter Frank、Thomas J. J. Müller
DOI:10.1039/c5ra03104d
日期:——
1-, 3-, and 5-Biarylsubstituted pyrazoles can be efficiently prepared by a microwave-assisted consecutivefour-componentsynthesis based upon a sequential Pd-catalyzed coupling–condensation–coupling (C3), a one-pot sequence which concatenates Sonogashira alkynylation and Suzuki arylation intercepted by pyrazole forming cyclocondensation of the ynone intermediate. This diversity-oriented approach enables
TfOH-Promoted Reaction of 2,4-Diaryl-1,1,1-Trifluorobut-3-yn-2-oles with Arenes: Synthesis of 1,3-Diaryl-1-CF3-Indenes and Versatility of the Reaction Mechanisms
作者:Aleksey V. Zerov、Anna N. Kazakova、Irina A. Boyarskaya、Taras L. Panikorovskii、Vitalii V. Suslonov、Olesya V. Khoroshilova、Aleksander V. Vasilyev
DOI:10.3390/molecules23123079
日期:——
The TfOH-mediated reactions of 2,4-diaryl-1,1,1-trifluorobut-3-yn-2-oles (CF₃-substituted diaryl propargyl alcohols) with arenes in CH₂Cl₂ afford 1,3-diaryl-1-CF₃-indenes in yields up to 84%. This new process for synthesis of such CF₃-indenes is complete at room temperature within one hour. The synthetic potential, scope, and limitations of this reaction were illustrated by more than 70 examples. The
1,2,6-Thiadiazine 1-Oxides: Unsaturated Three-Dimensional S,N-Heterocycles from Sulfonimidamides
作者:Jan-Hendrik Schöbel、Marco Thomas Passia、Nadja Anna Wolter、Rakesh Puttreddy、Kari Rissanen、Carsten Bolm
DOI:10.1021/acs.orglett.0c00666
日期:2020.4.3
Unprecedented three-dimensional 1,2,6-thiadiazine 1-oxides have been prepared by an aza-Michael-addition/cyclization/condensation reaction sequence starting from sulfonimidamides and propargyl ketones. The products have been further functionalized by standard cross-coupling reactions, selective bromination of the heterocyclic ring, and conversion into a β-hydroxy substituted derivative. A representative