18543-22-1Relevant academic research and scientific papers
Competing HB acceptors: An extensive NMR investigations corroborated by single crystal XRD and DFT calculations
Tiwari, Surbhi,Arya, Neeru,Mishra, Sandeep Kumar,Suryaprakash
, p. 15195 - 15202 (2021/05/21)
A series of N-benzoylanthranilamide derivatives have been synthesized with the substitution of competitive HB acceptors and investigated by NMR spectroscopy and single crystal XRD. The interesting rivalry for HB acceptance between CO and X (F or OMe) is observed in the investigated molecules which leads to an unusual increase in the electron density at the site of one of the NH protons, reflecting in the high field resonance in the 1H NMR spectrum. The NMR experimental findings and single crystal XRD are further reinforced by the DFT studies.
Regioselective Synthesis of 2° Amides Using Visible-Light-Induced Photoredox-Catalyzed Nonaqueous Oxidative C-N Cleavage of N, N-Dibenzylanilines
Neerathilingam, Nalladhambi,Bhargava Reddy, Mandapati,Anandhan, Ramasamy
supporting information, p. 15117 - 15127 (2021/10/25)
A visible-light-driven photoredox-catalyzed nonaqueous oxidative C-N cleavage of N,N-dibenzylanilines to 2° amides is reported. Further, we have applied this protocol on 2-(dibenzylamino)benzamide to afford quinazolinones with (NH4)2S2O8 as an additive. Mechanistic studies imply that the reaction might undergo in situ generation of α-amino radical to imine by C-N bond cleavage followed by the addition of superoxide ion to form amides.
Domino synthesis of pyrimido and imidazoquinazolinones
Fathalla, Walid,Nofal, Eman Y.,El-Moneim, Mohamed Abd
, p. 1266 - 1274 (2020/01/21)
A simple method for the synthesis of N-alkyl-2-arylquinazolin-4-amines, methyl 4-((2-arylquinazolin-4-yl)amino) butanoates, 6-aryl-2,3-dihydro-4H-pyrimido[1,2-c]quinazolin-4-ones, and 5-arylimidazo[1,2-c]quinazolin-3(2H)-ones has been described. It involves a simple reaction of N-(2-cyanophenyl)-substitutedbenzimidoyl chlorides with alkylamine, γ-aminobutyric acid, β-alanine, l-alanine, and glycine methyl esters hydrochloride in acetonitrile to afford the desired compounds after a series of instantaneous reactions that include Dimroth rearrangement. The reaction involves reflux for 12 hours, simple addition of reagents to an in situ generated benzimidoyl chloride, and simple workup, to form 21 examples of pure compounds in high yields. The active intermediate N-(2-cyanophenyl)-substitutedbenzimidoyl chlorides were formed by the reaction of N-(2-cyanophenyl)-substitutedbenzamides with thionyl chloride in a one-pot strategy. The alternative method described for this preparation deals with an exhausting multistep reactions starting from anthranilic acid.
N-Phenylbenzamide derivatives as alternative oxidase inhibitors: Synthesis, molecular properties, 1H-STD NMR, and QSAR
Barsottini, Mario R. O.,Carazzolle, Marcelo F.,Costa, Paulo C. S.,Evangelista, Joel S.,Miranda, Paulo C. M. L.,Nascimento, Andrey F. Z.,Pereira, Gon?alo A. G.,Pires, Bárbara A.,Rocco, Silvana A.,Sfor?a, Maurício L.,Silva, Jaqueline S.,Vieira, Maria L. L.,Zeri, Ana C. M.
, (2020/02/27)
In the present work, 117 N-phenylbenzamides (NPDs) were prepared and evaluated against recombinant AOX from the fungal pathogen Moniliophthora perniciosa. 1H, 13C NMR, FTIR, and mass spectra provided structural information on NPDs. The library compounds were tested as Alternative Oxidase inhibitors in two different assays using the model yeast Pichia pastoris: cell growth and oxygen consumption assays. The most active compound, 3FH, was further characterized by DRX and 1H-NMR-STD. Single crystal X-ray diffraction showed intra- and intermolecular interactions of 3FH in solid-state and elucidated its 3D structural configuration. 1H-NMR-STD allowed us to derive protein-ligand interactions in a membrane-mimetic system and evidenced an outstanding interaction of 3FH with this enzyme. Results of both biological assays were used as input to Quantitative Structure-Activity Relationship models, which highlighted the more important molecular fragments contributions for protein-ligand interaction.
Synthesis of 2-(2-Hydroxyaryl)-4H-benzo[e][1,3]oxazin-4-ones by Palladium-Catalyzed C(sp2)?H Hydroxylation via Electro-chemical Oxidation
Wu, Hongfeng,An, Qi,He, Chaoyin,Fan, Xiaodong,Guo, Weihao,Zuo, Minghui,Xu, Chunzhao,Guo, Rui,Chu, Wenyi,Sun, Zhizhong
supporting information, p. 2459 - 2465 (2020/04/29)
An electrochemical direct ortho-hydroxylation of 2-aryl-4H-benzo[e][1,3]oxazin-4-ones was developed with Pd(OAc)2 as catalyst, oxazine ring as a directing group and Oxone as the hydroxylation reagent. A series of hydroxylation products were obtained under mild conditions, and the yields were from medium to good. This method is characterized by good functional group tolerance and a wide range of substrates. More importantly, use anodic oxidation to avoid the use of potentially toxic and polluting oxidants. A gram-scale direct electrochemical hydroxylation of 2-phenyl-4H-benzo[e][1,3]oxazin-4-one was performed, and the hydroxylation product was applied to synthesize the drug deferasirox. In addition, the single crystal of 2-(2-hydroxyphenyl)-4H-benzo[e][1,3]oxazin-4-one was obtained and determined by X-ray diffraction. Finally, the reaction mechanism was proposed and verified by cyclic voltammetry (CV). This protocol also provides an alternative electrochemical hydroxylation methodology for the functionalization of molecules. (Figure presented.).
Synthesis and Antimicrobial Activity of Methyl 2-(2-(2-Arylquinazolin-4-yl)oxy) Acetylamino Alkanoates
Megahed,Fathalla,Alsheikh, Amer A.
, p. 2799 - 2808 (2018/11/23)
A series of methyl 2-(2-(2-arylquinazolin-4-yl)oxy) acetylamino alkanoate have been developed via N,N′-dicyclohexylcarbodiimide coupling of (2-arylquinazolin-4-yloxy) acetic acids with amino acid ester hydrochlorides. The O-substituted carboxylic acids we
Photocatalytic benzene and benzene derivative direct hydroxylation or amination method
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Paragraph 0148-0149, (2017/11/29)
The invention discloses a photocatalytic benzene and benzene derivative direct hydroxylation or amination method. The method is characterized by comprising the following steps: (1) adding a photo-sensitizer and a cobalt catalyst into a solvent to obtain a solution (A); (2) adding benzene (or benzene derivatives), water, ammonia gas, and amide derivatives (or sulfonamide derivatives) into the solution (A) to obtain a solution (B); and (3) in a N2 (or Ar) environment, radiating the solution (B) by a medium pressure mercury lamp, a high pressure mercury lamp, a xenon lamp, or an LED lamp to obtain phenols or amines and H2. For the first time, a photo-sensitizer and a cobalt catalyst are combined and applied to photocatalytic hydroxylation and amination of benzene. The conditions of the method are mild, light is taken as the driving energy, no oxidant is added, the only byproduct is H2, and the whole process is green, concise, and efficient. High selective benzene one-step hydroxylation to generate phenol or high selective phenol/benzene one-step amination to generate aniline is realized, and the method can be applied to the production of phenol and aniline.
One-pot synthesis of polyhydropyrido[1,2-a]indoles and tetracyclic quinazolinones from 2-arylindoles using copper-mediated oxidative tandem reactions
Yamashita, Mitsuaki,Nishizono, Yukari,Himekawa, Seiya,Iida, Akira
, p. 4123 - 4131 (2016/07/06)
We developed facile one-pot methods for the transformation of 2-arylindoles to polyhydropyrido[1,2-a]indoles and tetracyclic quinazolinones. The copper-catalyzed oxidation of 2-arylindoles to C-acylimines followed by aza-Diels–Alder reactions or oxidative
Anti-convulsant potential of quinazolinones
Patel, Harun M.,Noolvi, Malleshappa N.,Shirkhedkar, Atul A.,Kulkarni, Abhijeet D.,Pardeshi, Chandrakantsing V.,Surana, Sanjay J.
, p. 44435 - 44455 (2016/06/09)
A series of novel quinazoline derivatives were synthesized, virtually screened through different filters and evaluated for their anticonvulsant activity against electrically and chemically induced seizures, compared with that of the standard drugs methaqualone and sodium valproate. Compound 48, 3-(2-aminophenyl)-7-chloro-2-phenylquinazolin-4(3H)-one, was found to be the most potent compound of the series accompanied by relatively low neurotoxicity and low toxicity in the median lethal dose test as compared with the reference drugs. The obtained results showed that compounds 12, 48, 49 and 50 could be useful templates for future design, optimization, and investigation to construct more active analogs.
Structure-activity relationships of 2-arylquinazolin-4-ones as highly selective and potent inhibitors of the tankyrases
Nathubhai, Amit,Haikarainen, Teemu,Hayward, Penelope C.,Mu?oz-Descalzo, Silvia,Thompson, Andrew S.,Lloyd, Matthew D.,Lehti?, Lari,Threadgill, Michael D.
, p. 316 - 327 (2016/05/19)
Tankyrases (TNKSs), members of the PARP (Poly(ADP-ribose)polymerases) superfamily of enzymes, have gained interest as therapeutic drug targets, especially as they are involved in the regulation of Wnt signalling. A series of 2-arylquinazolin-4-ones with varying substituents at the 8-position was synthesised. An 8-methyl group (compared to 8-H, 8-OMe, 8-OH), together with a 4′-hydrophobic or electron-withdrawing group, provided the most potency and selectivity towards TNKSs. Co-crystal structures of selected compounds with TNKS-2 revealed that the protein around the 8-position is more hydrophobic in TNKS-2 compared to PARP-1/2, rationalising the selectivity. The NAD+-binding site contains a hydrophobic cavity which accommodates the 2-aryl group; in TNKS-2, this has a tunnel to the exterior but the cavity is closed in PARP-1. 8-Methyl-2-(4-trifluoromethylphenyl)quinazolin-4-one was identified as a potent and selective inhibitor of TNKSs and Wnt signalling. This compound and analogues could serve as molecular probes to study proliferative signalling and for development of inhibitors of TNKSs as drugs.
