- Metal-Free, DBU-Mediated, Microwave-Assisted Synthesis of Benzo[c]xanthones by Tandem Reactions of Alkynyl-1,3-diketones
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A base-mediated, green, microwave-assisted efficient preparation of a diverse benzoxanthone library from variety of readily accessible γ-alkynyl 1,3-diketones is reported. The synthesis is based on tandem reactions involving intramolecular cyclization, propargyl-allenyl isomerization, and electrocyclization in one pot. Some of the benzoxanthones are also synthesized by the one-pot reaction of 1,3-diketone and alkynyl bromide under basic heating conditions. This transformation also results in the construction of one new C?C bond and one new C?O bond. (Figure presented.).
- Liang, Yi-En,D. Barve, Balaji,Kuo, Yao-Haur,Fang, Hsu-Wei,Kuo, Ting-Shen,Li, Wen-Tai
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supporting information
p. 505 - 511
(2020/12/01)
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- Tribenzotriquinacene: A versatile synthesis and C3-chiral platforms
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Fusing rings: A new synthesis of the bowl-shaped hydrocarbon tribenzotriquinacene is presented (see scheme). The synthesis allows easy access to ortho-functionalized and C3-chiral derivatives that are attractive for supramolecular chemistry and
- Markopoulos, Georgios,Henneicke, Lars,Shen, Jun,Okamoto, Yoshio,Jones, Peter G.,Hopf, Henning
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supporting information
p. 12884 - 12887
(2013/02/23)
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- New mononuclear Pd(II) complexes of sterically hindered bispyrazolylmethanes
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Three new palladium(II) complexes incorporating the bispyrazolylmethane core have been synthesised and fully characterised in the solution and solid state. Single crystal X-ray studies revealed almost complete blocking of the upper face of the palladium ion by the substituents at the 3- and 5-positions of the pyrazole rings. Preliminary screening of the complexes for palladium(II) mediated catalysis revealed good catalytic activity for the Heck coupling reaction.
- Jones, Michael W.,Adlington, Robert M.,Baldwin, Jack E.,Le Pevelen, Delphine D.,Smiljanic, Nicolas
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experimental part
p. 1097 - 1101
(2010/06/15)
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- Economic preparation of 1,3-diphenyl-1,3-bis(diphenylphosphino)propane: A versatile chiral diphosphine ligand for enantioselective hydrogenations
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The enantioselective hydrogenation of 1,3-diarylpropane-1,3-diones with chiral Ru(II)-diphosphine catalyst has been studied. In a first approach it was found, that Tol-BINAP together with Ru(COD)methallyl2 formed the most selective catalyst. On
- Dubrovina, Natalia V.,Tararov, Vitali I.,Monsees, Axel,Kadyrov, Renat,Fischer, Christine,Boerner, Armin
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p. 2739 - 2745
(2007/10/05)
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- Synthesis of dibenzoylmethane derivatives and inhibition of mutagenicity in Salmonella typhimurium
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Twenty dibenzoylmethanes with methyl, methoxy, bromo, chloro, or fluoro substitution on either one or both benzene rings were synthesized and assayed for inhibition of the mutagenicity of 2-nitrofluorene in S. typhimurium TA98. 2,2-Dimethoxy, 3,3-dimethoxy and 3,3,4,4-tetramethoxydibenzoylmethane was as active as dibenzoylmethane. None of the halogen-substituted dibenzoylmethanes were active. These results demonstrate that dibenzoylmethanes can inhibit the mutagenicity of 2-nitrofluorene, and that modifications made on the benzene rings of dibenzoylmethane cannot enhance the antimutagenicity of this parent compound.
- Choshi,horimoto,Wang,Nagase,Ichikawa,Sugino,Hibino
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p. 1047 - 1049
(2007/10/02)
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