Author: "Karapetyan, Vahuni" / Publisher: elsevier b.v. - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "Karapetyan, Vahuni" Publisher elsevier b.v.

Author: Karapetyan, Vahuni, Mkrtchyan, Satenik, Ghazaryan, Gagik, Villinger, Alexander, Fischer, Christine, and Langer, Peter
Subjects: *ORGANIC synthesis, *SALICYLATES, *PYRAN, *CONDENSATION, *BUTADIENE, *LEWIS acids, *TITANIUM tetrachloride
Abstract: Abstract: The TiCl4-mediated formal [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 1,1-dimethoxy-4,4-dichlorobut-1-en-3-one afforded a variety of functionalized 6-dichloromethyl-4-methoxysalicylates with very good regioselectivity. Some of the products were transformed into 6-formyl-4-methoxysalicylates. The employment of Me3SiOTf instead of TiCl4 resulted in a change of the regioselectivity and in the formation of functionalized 2-(dichloromethyl)pyran-4-ones. [Copyright &y& Elsevier]
Published: 2009
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Author: Karapetyan, Vahuni, Mkrtchyan, Satenik, Lubbe, Mathias, Villinger, Alexander, and Langer, Peter
Subjects: *ORGANIC synthesis, *SALICYLATES, *CONDENSATION, *BUTADIENE, *PHYSICAL & theoretical chemistry
Abstract: Abstract: 6-Formylsalicylates are prepared by regioselective [3+3] cyclocondensations of 1,3-bis(silyloxy)-1,3-butadienes with 1,1-dichloro-4-ethoxy-3-buten-2-ones and subsequent transformation of the dichloromethyl into a formyl group. [Copyright &y& Elsevier]
Published: 2009
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Author: Karapetyan, Vahuni, Mkrtchyan, Satenik, Dang, Tung T., Villinger, Alexander, Reinke, Helmut, and Langer, Peter
Subjects: *RING formation (Chemistry), *CYCLOPOLYMERIZATION, *CHEMICAL reactions, *CHEMICAL processes
Abstract: Abstract: 6-Iodo- and 6-bromomethyl-5,6-dihydro-4H-1,2-oxazines were prepared by condensation of dilithiated acetophenone-oximes with allylbromide and subsequent regioselective iodine- or NBS-mediated cyclization. [Copyright &y& Elsevier]
Published: 2008
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Author: Attanasi, Orazio A., Gianfranco Favi, Giorgi, Gianluca, Mantellini, Fabio, Karapetyan, Vahuni, and Langer, Peter
Subjects: *ORGANIC synthesis, *CATALYSTS, *RING formation (Chemistry), *ASYMMETRY (Chemistry), *ORGANIC cyclic compounds, *TEMPERATURE effect
Abstract: Abstract: Unknown spiro-cyclopropanated 1-aminopyrrol-2-ones are regioselectively prepared in high yields by Bi(OTf)3-catalyzed one-pot ‘Mukaiyama–Michael addition/cyclization/ring-contraction’ reactions of 1,2-bis(trimethylsilyloxy)cyclobutene with 1,2-diaza-1,3-butadienes at room temperature. [Copyright &y& Elsevier]
Published: 2009
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Author: Rashid, Muhammad A., Rasool, Nasir, Appel, Bettina, Adeel, Muhammad, Karapetyan, Vahuni, Mkrtchyan, Satenik, Reinke, Helmut, Fischer, Christine, and Langer, Peter
Subjects: *BUTADIENE, *CHEMICAL reactions, *NITRILES, *ORGANIC chemistry
Abstract: Abstract: Functionalized 1-azaxanthones (5-oxo-5H-[1]-benzopyrano[2,3-b]pyridines) were prepared by TMSOTf-mediated condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-cyanochromones and subsequent base-mediated domino ‘retro-Michael/nitrile-addition/heterocyclization’ reaction. [Copyright &y& Elsevier]
Published: 2008
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