1022-46-4Relevant articles and documents
Pd-carbene catalyzed carbonylation reactions of aryl iodides
Xue, Liqin,Shi, Lijun,Han, Yuan,Xia, Chungu,Huynh, Han Vinh,Li, Fuwei
, p. 7632 - 7638 (2011)
A series of carbene complexes [PdBr2(iPr 2-bimy)L] (C2-C13) with different types of co-ligands (L) have been tested for their catalytic activities in the carbonylative annulation of 2-iodophenol with phenylacetylene in DMF to afford the respective flavone 2a. Complex C12 with an N-phenylimidazole co-ligand showed the best activity and also afforded high yields when the substrate scope was extended to other aryl or pyridyl acetylenes. In addition, catalyst C12 was also efficient in the carbonylative annulation of 2-iodoaniline with acid chlorides giving the desirable 2-substituted 4H-3,1-benzoxazin-4-ones (4) in good yields. Additionally, this Pd-NHC complex also proved to be a very efficient catalyst for the hydroxycarbonylation of iodobenzene derivatives at low catalyst loading and under low CO pressure. These results demonstrate the versatility and efficiency of this phosphine-free Pd(ii)-NHC complex in different types of carbonylations of aryl iodides under mild conditions. The Royal Society of Chemistry 2011.
Visible Light Photocatalytic Aerobic Oxygenation of Indoles and pH as a Chemoselective Switch
Zhang, Chenhao,Li, Sanliang,Bure?, Filip,Lee, Richmond,Ye, Xinyi,Jiang, Zhiyong
, p. 6853 - 6860 (2016)
An efficient chemodivergent strategy for visible light photocatalysis is developed. In the presence of a dicyanopyrazine-derived chromophore (DPZ) photocatalyst, aerobic photooxygenation of indoles could produce either isatins or formylformanilides in satisfactory yields by judiciously selecting inorganic salts or modulating the reaction pH. The current chemodivergent method is also effective with 2-substituted indoles, opening straightforward synthetic routes to valuable 2,2-disubstituted 3-oxindoles, formylformanilide derivatives, and benzoxazinones. Mechanistic investigations involving cyclic voltammetry studies further confirm that reaction pH influences the electrochemical properties of DPZ, thus affecting the oxidative pathway by which indoles are being transformed.
Reaction of Anthranilic Acid with Orthoesters: A New Facile One-pot Synthesis of 2-Substituted 4H-3,1-Benzoxazin4-ones
Khajavi, Mohammad S.,Montazari, Nasser,Sadat Hosseini
, p. 286 - 287 (1997)
The synthesis of 2-substituted 4H-3,1-benzoxazin-4-ones by the condensation of anthranilic acid and orthoesters under classical heating and microwave irradiation is described.
Design, synthesis and in vivo screening of some novel quinazoline analogs as anti-hyperlipidemic and hypoglycemic agents
Mokale, Santosh N.,Palkar, Akash D.,Dube, Pritam N.,Sakle, Nikhil S.,Miniyar, Pankaj B.
, p. 272 - 276 (2016)
A novel series of substituted quinazoline derivatives were designed, synthesized and evaluated for their hypolipidemic activity in cholesterol induced hyperlipidemic rats. In vivo screening concluded that compounds A-4, C-5 and C-6 have shown potent antihyperlipidemic activity by decreasing the plasma level of triglycerides (TG), very low density lipoprotein (VLDL), low density lipoprotein (LDL), followed by increase in level of high density lipoprotein (HDL).
Synthesis of some new benzoxazine derivatives of biological interest
Verma, Manjusha,Singh, Sundaram,Singh
, p. 499 - 502 (2003)
The synthesis of a number of biologically important imino-quinazolones has been achieved by the condensation of 3-amino-2-aryl-4-quinazolone and aromatic aldehydes.
A new series of Schiff base derivatives bearing 1,2,3-triazole: Design, synthesis, molecular docking, and α-glucosidase inhibition
Nasli-Esfahani, Ensieh,Mohammadi-Khanaposhtani, Maryam,Rezaei, Sepideh,Sarrafi, Yaghoub,Sharafi, Zeinab,Samadi, Nasser,Faramarzi, Mohammad Ali,Bandarian, Fatemeh,Hamedifar, Haleh,Larijani, Bagher,Hajimiri, Mirhamed,Mahdavi, Mohammad
, (2019)
A series of new Schiff bases bearing 1,2,3-triazole 12a?o was designed, synthesized, and evaluated as α-glucosidase inhibitors. All the synthesized compounds showed promising inhibition against α-glucosidase and were more potent than the standard drug aca
4H-Benzo[d][1,3]oxazin-4-ones and Dihydro analogs from substituted anthranilic acids and orthoesters
Annor-Gyamfi, Joel K.,Bunce, Richard A.
, (2019)
A one-pot route to 2-alkyl and 2-aryl-4H-benzo[d][1,3]oxazin-4-ones (also known as 4H-3,1-benzoxazin-4-ones) has been developed and studied. The method involves the reaction of aryl-substitutedanthranilic acidswithorthoesters inethanol catalyzedby acetic acid. Additionally,wehave also investigated the reaction under microwave conditions. Not all of the substrates were successful in yielding the target heterocycles as some of the reactions failed to undergo the final elimination. This process led to the isolation of (±)-2-alkyl/aryl-2-ethoxy-1,2-dihydro-4H-benzo[d][1,3]oxazin-4-ones. The formation of the dihydro analogs correlated with the electron density on the aromatic ring: Electron-donating groups favored the 4H- benzo[d][1,3]oxazin-4-ones, while electron-withdrawing groups tended to favor the dihydro product. Substituting a pyridine ring for the benzene ring in the substrate acid suppressed the reaction.
In vitro bacteriostatic and DNA interaction studies of drug-based mixed-ligand complexes of cobalt(II)
Patel, Mohan,Chhasatia, Mehul,Bhatt, Bhupesh
, p. 220 - 230 (2011)
The dinuclear cobalt(II) complexes with ciprofloxacin and bidentate ligands were synthesized and characterized using infrared spectra, electronic spectra, magnetic measurements, elemental analyses, thermal investigation, and mass spectroscopy. Here in we
Synthesis, characterization, and screening for analgesic and anti-inflammatory activities of new 1,3,4-oxadiazole derivatives linked to quinazolin-4-one ring
Dewangan, Dhansay,Verma, Vinay Sagar,Nakhate, Kartik T.,Tripathi, Dulal Krishna,Kashyap, Pranita,Dhongade, Hemant
, p. 2143 - 2154 (2016)
In the present study, several new 1,3,4-oxadiazole derivatives linked with quinazolin-4-one moiety were synthesized by following steps. 2-methyl -4H-3, 1-benzoxazin-4-one, and 2-phenyl -4H-3, 1-benzoxazin-4-one were synthesized in the first and second step by stirring anthranilic acid in pyridine with benzoyl chloride and with an acetic anhydride for 30 min at room temperature. On treatment with semicarbazide with the above synthesized intermediates, that is, 2-methyl-4H-3,1-benzoxazin-4-one, and 2-phenyl-4H-3,1-benzoxazin-4-one in the third step afforded 2-methyl-4-oxoquinazoline-3(4H)-carbohydrazide and 2-phenyl-4-oxoquinazoline-3(4H)-carbohydrazide. These were introduced in cyclization reaction with different aromatic acids, aromatic aldehydes, and carbon disulfide in the next step, producing the corresponding 3-(4-acetyl-5-aryl-4,5-dihydro-1,3,4-oxadiazol-2-yl)-2-phenyl-quinazolin-4(3H)-one derivatives, 3-(4-acetyl-5-aryl-4,5-dihydro-1,3,4-oxadiazol-2-yl)-2-methyl-quinazolin-4(3H)-one derivatives, 3-(5-aryl-1,3,4-oxadiazol-2-yl)-2-phenylquinazolin-4(3H)-one derivatives and 3-(5-aryl-1,3,4-oxadiazol-2-yl)-2-methylquinazolin-4(3H)-one derivatives. Purity of these synthesized derivatives was confirmed by thin layer chromatography, melting point. Structure of the derivatives was set up by determining infrared spectroscopy, nuclear magnetic resonance, and mass spectroscopy. All the synthesized derivatives were evaluated for their analgesic and anti-inflammatory activities in mice and rats. In animal studies, the derivatives 3-[4-acetyl-5-(2-hydroxyphenyl)-4,5-dihydro-1,3,4-oxadiazol-2-yl]-2-phenylquinazolin-4(3H)-one and 3-[4-acetyl-5-(4-hydroxy-3-methoxyphenyl)-4,5-dihydro-1,3,4-oxadiazol-2-yl]-2-phenylquinazolin-4(3H)-one shown more potent analgesic activity and the derivatives 3-[4-acetyl-5-(4-methoxyphenyl)-4,5-dihydro-1,3,4-oxadiazol-2-yl]-2-phenylquinazolin-4(3H)-one and 3-[4-acetyl-5-(4-methoxyphenyl)-4,5-dihydro-1,3,4-oxadiazol-2-yl]-2-methylquinazolin-4(3H)-one shown more potent anti-inflammatory activity as compared to other derivatives. The results of current study indicate that cyclization of carbohydrazide group of intermediate 2-methyl-4-oxoquinazoline-3(4H)-carbohydrazide and 2-phenyl-4-oxoquinazoline-3(4H)-carbohydrazide with different aromatic acids, aromatic aldehydes, and carbon disulfide produces novel quinazolin-4-one linked oxadiazole derivatives with potent analgesic and anti-inflammatory activities.
Silica-bound benzoyl chloride mediated the solid-phase synthesis of 4H-3, 1-benzoxazin-4-ones
Rad-Moghadam, Kurosh,Rouhi, Somayeh
, (2009)
The solid-phase synthesis of 4H-3, 1-benzoxazin-4-ones was achieved using silica-bound benzoyl chloride (SBBC) as dehydrating agent in reaction with 2-acylaminobenzoic acids. The silica-grafted reagent (SBBC) was simply recovered after reaction and reused several times.
