21493-94-7Relevant academic research and scientific papers
Trialkylphosphine-Mediated Synthesis of 2-Acyl Furans from Ynenones
Xu, Chao,Wittmann, Stéphane,Gemander, Manuel,Ruohonen, Venla,Clark, J. Stephen
, p. 3556 - 3559 (2017/07/17)
A novel reaction for the synthesis of 2-acyl furans is reported. The reaction is believed to proceed by sequential addition of a trialkylphosphine to an ynenone, 5-exo-dig cyclization to form the furan, and oxidation of the resulting phosphonium ylide with molecular oxygen. Many common functional groups are tolerated during the reaction, and the products are obtained in good to excellent yield under the mild conditions. This methodology offers efficient access to biologically important compounds, including fused polycyclic compounds and furaldehydes, from simple starting materials.
Photochromic Indeno-Fused Ring Pyran Compounds
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Paragraph 0214; 0215, (2015/05/26)
The present invention relates to photochromic indeno-fused ring pyran compounds represented by the following Formula (I-A): The present invention also relates to photochromic dichroic compounds, such as represented by Formula (I-A), in which (i) Z2
Fused ring indeno compounds for preparation of photochromic compounds
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Paragraph 0281, (2015/05/26)
The present invention relates to intermediate compounds represented by the following Formula (I-A), The intermediate compounds of the present invention, such as represented by Formula (I-A), can be used to prepare photochromic compounds, such as photochro
Method Of Preparing Fused Ring Indeno Compounds
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Paragraph 0196; 0197, (2015/05/26)
The present invention relates to methods of preparing fused ring indeno compounds that involves reacting together a dienophile and a lactone compound, in the presence of a catalyst, and a carboxylic acid anhydride. With some embodiments, the fused ring in
Efficient two-step sequence for the synthesis of 2,5-disubstituted furan derivatives from functionalized nitroalkanes: Successive Amberlyst A21- and Amberlyst 15-catalyzed processes
Palmieri, Alessandro,Gabrielli, Serena,Ballini, Roberto
supporting information; experimental part, p. 6165 - 6167 (2010/10/20)
The nitroaldol reaction of ketal-functionalized nitroalkanes with α-oxoaldehydes, promoted by Amberlyst A21, followed by acidic treatment (Amberlyst 15) of the obtained nitroalkanol, leads to the formation of 2,5-disubstituted furans in good yields. The p
Singlet-oxygen-mediated one-pot synthesis of 3-keto-tetrahydrofurans from 2-(β-hydroxyalkyl) furans
Tofi, Maria,Koltsida, Konstantina,Vassilikogiannakis, Georgios
supporting information; experimental part, p. 313 - 316 (2009/07/04)
(Chemical Equation Presented) Photooxygenation of 2-(β-hydroxyalkyl) furans affords, in one synthetic operation and in high yields, 3-keto-tetrhydrofuran motifs via intramolecular Michael-type addition to the 1,4-enedione intermediate.
Palladium-catalyzed acyldemetallation and carbonylation reactions of organomercurials for the synthesis of unsymmetrical ketones
Bumagin, N. A.,More, P. G.,Beletskaya, I. P.
, p. 379 - 388 (2007/10/02)
The palladium-catalyzed acyldemetallation reactions of organomercurials (R2Hg or AlkHgI) provide a mild, selective and general method for the synthesis of unsymmetrical heterocyclic ketones.High yields of ketones (RCOR') were obtained along with small amounts of homocoupling products (R2).The reaction is accelerated by a nucleophilic catalyst with both organic groups of R2Hg taking part in the reaction.The selectivity of the reaction towards the ketone can be increased by carrying out the reaction with a suitable combination of reactants under vacuum.The palladium-catalyzed carbonylation of organomercurials in the presence of ArI is another route to unsymmetrical ketones.The AlkHgI-ArI system undergoes carbonylation in the presence of palladium complex and excess iodide ion under mild conditions to give high yields of unsymmetrical ketones.The selectivity and rate of the reaction depend upon the nature of the catalyst, solvent and the concentration of iodide ion.
