76162-49-7Relevant academic research and scientific papers
Regiocontrolled synthesis of 2,4,6-triarylpyridines from methyl ketones, electron-deficient acetylenes and ammonium acetate
Shabalin, Dmitrii A.,Dvorko, Marina Yu.,Schmidt, Elena Yu.,Trofimov, Boris A.
supporting information, p. 2703 - 2715 (2021/04/07)
A novel one-pot two-step approach for the synthesis of 2,4,6-triarylpyridinesvia t-BuOK/DMSO-promotedC-vinylation of a variety of methyl ketones with electron-deficient acetylenes (alkynones) followed by a cyclization of thein situgenerated unsaturated 1,5-dicarbonyl species with ammonium acetate has been developed. This approach possesses competitive advantages such as high regioselectivity, available starting materials and the absence of transition-metal catalysts, oxidants and undesirable byproducts. A wide synthetic utility of the developed approach was demonstrated by the synthesis of trisubstituted, tetrasubstituted and fused pyridines.
Triphenylpyrylium salt-sensitized photoreactions of 1,4-diaryl-2,3- dioxabicyclo[2.2.2]octanes through competitive single electron-transfer pathway and proton-catalyzed pathway
Kamata, Masaki,Kaneko, Jun-Ichi,Hagiwara, Jun-Ichi,Akaba, Ryoichi
, p. 7423 - 7428 (2007/10/03)
2,4,6-Triphenylpyrylium tetrafluoroborate (TPPBF4)-sensitized photoinduced electron-transfer (PET) reactions of 1,4-diaryl-2,3-dioxabicyclo[2. 2.2]octanes 5 (a: Ar1 = Ar2 = p-MeOC6H 4, b: Ar1 = Ar2 = p-MeC6H 4, c: Ar1 = Ar2 = Ph) underwent novel fragmentation through their radical cations to give 1,4-diarylbutan-1,4-diones 6 accompanied by elimination of ethylene. On the other hand, 4-aryl-cyclohex-3- en-1-ones 7, p-substituted phenols 8, and 4-aryl-4-aryloxycyclohexanones 9 were produced through proton-catalyzed pathways when the PET reactions of 5 were performed in the absence of a certain base such as 2,6-di-tert-butylpyridine (DTBP). Particularly, the formation of 9 is consistent with the novel cationic rearrangement involving nucleophilic O-1,2-aryl shifts and C-1,4-aryl shifts.
Free Radicals: XXVI. Reaction of 2,4,6-Triphenylpyranyl Radical with Oxygen
Tanaseichuk, B. S.,Pryanichnikova, M. K.,Tikhonova, L. G.
, p. 442 - 444 (2007/10/03)
Triphenylpyranyl radical reacts with oxygen to give 1,3,5-tiphenyl-2-pentene-1,5-dione, 3-phenoxymethyl-2,5-diphenylfuran, and 5-phenoxymethyl-2,4-diphenylfuran.
SYNTHESIS AND PROPERTIES OF 3-FORMYL-4H-PYRANS
Suzdalev, K. F.,Koblik, A. V.
, p. 509 - 512 (2007/10/02)
The Vilsmeier formylation of 4H-pyrans afforded 3-formyl-4H-pyrans.These were converted to 3-formylpyrylium salts, from which pyridine or pyridine salts with an aldehyde group at C(3) were obtained.The reaction between 3-formyl-4-allyl-4H-pyran
UNTERSUCHUNGEN AN DIAZOVERBIDUNGEN UND AZIDEN-XLV ELECTROPHILE DIAZOALKANSUBSTITUTION AN PHOSPHORYLDIAZOMETHANEN MIT THIAPYRYLIUMSALZEN
Khbeis, S. G.,Maas, G.,Regitz, M.
, p. 811 - 817 (2007/10/02)
Electrophilic diazoalkane substitution of the phosphoryl diazomethanes 2a-e with 2,6-di-tert-butylthiapyrylium-tetrafluoroborate (1) yiels the 4-(diazomethyl)-4H-thiapyranes 3a-e; the olefin 5 is formed as by-product in all cases.The μ-allylpalladium chlo
Pyridinethiones, X. - Preparation of Pentene-1,5-dione Enolates and of 3-Benzoyl-2(1H)-pyridinethiones
Becher, Jan,Asaad, Fahmy M.,Winckelmann, Ib
, p. 620 - 627 (2007/10/02)
An effective synthesis of 3-benzoyl-2(1H)-pyridinethiones 5a-n from stable enol salts 4 of pentene-1,5-diones and isothiocyanates is described.An attempt to prepare a 3-acetyl-2(1H)-pyridinethione from the cyano compound 7 and CH3MgX yielded the ketimine
Pyrylium Compounds. XXI. - Structure and Tautomerism of Pseudobases of Unsymmetrically Substituted 2,4,6-Triarylpyrylium Salts
Fischer, Gerhard W.,Herrmann, Michael
, p. 287 - 302 (2007/10/02)
Hydrolytic ring opening of unsymmetrically substituted 2,4,6-triarylpyrylium salts 11 results in a mixture of two tautomeric pseudobases, the penten-1,5-diones 13 and 14.In crystalline state as a rule one of these tautomers markedly predominates, whereas
The Preparation of Pyridiniums from Pyryliums
Katritzky, Alan R.,Lloyd, Jeremy M.,Patel, Ranjan C.
, p. 117 - 124 (2007/10/02)
Mild preparative conditions are described for the reaction of primary alkyl-, secondary alkyl-, and aryl-primary amines (including weakly basic amines) with pyryliums (including those with bulky α-substituents).Conditions were optimized by 13C n.m.r. stud
