Results 41 to 50 of about 8,948 (229)

Carbohydrate-auxiliary assisted preparation of enantiopure 1,2-oxazine derivatives and aminopolyols

Beilstein Journal of Organic Chemistry, 2012
An approach to enantiopure hydroxylated 2H-1,2-oxazine derivatives is presented utilizing the [3 + 3] cyclisation of lithiated alkoxyallenes and an L-erythrose-derived N-glycosyl nitrone as precursors.
Marcin Jasiński, Dieter Lentz, Hans-Ulrich Reissig   +2 more
doaj   +1 more source

Correction: Novel Synthetic Oxazines Target NF-κB in Colon Cancer In Vitro and Inflammatory Bowel Disease In Vivo. [PDF]

PLoS ONE, 2017
[This corrects the article DOI: 10.1371/journal.pone.0163209.].
Anilkumar C Nirvanappa, Chakrabhavi Dhananjaya Mohan, Shobith Rangappa, Hanumappa Ananda, Alexey Yu Sukhorukov, Muthu K Shanmugam, Mahalingam S Sundaram, Siddaiah Chandra Nayaka, Kesturu S Girish, Arunachalam Chinnathambi, M E Zayed, Sulaiman Ali Alharbi, Gautam Sethi, Basappa, Kanchugarakoppal S Rangappa   +14 more
doaj   +1 more source

Chemical reactivity of ethyl 4-(1-ethyl-1,2-dihydro-4-hydroxy-2-oxoquinolin-3-yl)-2,4-dioxobutanoate towards some nucleophilic reagents

Journal of the Turkish Chemical Society, Section A: Chemistry, 2016
A novel series of heterocyclic systems linked with quinolin-2-one was efficiently synthesized from reaction of ethyl 4-(1-ethyl-1,2-dihydro-4-hydroxy-2-oxoquinolin-3-yl) -2,4-dioxobutanoate (1) with a variety of nitrogen and/or carbon nucleophiles.
Hany Hassanin, Magdi A. Ibrahim, Shimaa Badran   +2 more
doaj   +1 more source

Solid-Phase Synthesis of ɤ-Lactone and 1,2-Oxazine Derivatives and Their Efficient Chiral Analysis. [PDF]

PLoS ONE, 2016
Derivatives of 3-methyl-3,6-dihydro-2H-1,2-oxazine-6-carboxylic acid prepared by regioselective hetero Diels-Alder reaction of arylnitroso compounds with sorbic acid were used for solid-phase synthesis of a library of derivatives that included ...
Sona Krupkova, Gonzalo Pazos Aguete, Leona Kocmanova, Tereza Volna, Martin Grepl, Lucie Novakova, Marvin John Miller, Jan Hlavac   +7 more
doaj   +1 more source

Synthesis of 3,6‐Dihydro‐2H‐[1, 2]‐Oxazines from Nitroarenes and Conjugated Dienes, Catalyzed by Palladium/Phenanthroline Complexes and Employing Phenyl Formate as a CO Surrogate

ChemCatChem, 2018
Palladium/phenanthroline catalyzed reduction of nitroarenes by in situ‐generated carbon monoxide, from the decomposition of phenyl formate, affords the corresponding nitrosoarenes. The latter are trapped by conjugated dienes to give the corresponding 3,6‐
Mohamed A. El-atawy, D. Formenti, F. Ferretti, F. Ragaini   +3 more
semanticscholar   +1 more source

Discovery of C-3 Tethered 2-oxo-benzo[1,4]oxazines as Potent Antioxidants: Bio-Inspired Based Design, Synthesis, Biological Evaluation, Cytotoxic, and in Silico Molecular Docking Studies

Frontiers in Chemistry, 2018
The discovery of C-3 tethered 2-oxo-benzo[1,4]oxazines as potent antioxidants is disclosed. All the analogs 20a-20ab have been synthesized via “on water” ultrasound-assisted irradiation conditions in excellent yields (upto 98%).
Vashundhra Sharma, Pradeep K. Jaiswal, Mukesh Saran, Dharmendra Kumar Yadav, Saloni, Manas Mathur, Ajit K. Swami, Sanjeev Misra, Mi-hyun Kim, Sandeep Chaudhary   +9 more
doaj   +1 more source

Reductive Cleavage of 1,2-Oxazines Promoted by Zinc and Ammonium Chloride; Mild One Pot Preparation of γ-Hydroxy Ketones

E-Journal of Chemistry, 2012
A facile method for a mild single pot reductive cleavage of 1,2-oxazines to γ-hydroxy ketones was developed using zinc and aqueous ammonium chloride as the reagent in methanol.
P. Sunil Kumar, K. M. Lokanatha Rai
doaj   +1 more source

Synthesis of 2-substituted benzimidazole, coumarin, benzo[b][1,4]oxazin and dihydropyrimidinone derivatives using core-shell structured Fe3O4@SiO2-ZnCl2 nanoparticles as an effective catalyst

Results in Chemistry, 2020
In this paper, a magnetic nanocatalyst of Fe3O4@SiO2-ZnCl2 has been used which enhances the synthesis of benzimidazoles, coumarins, benzoxazines and dihydropyrimidinones. To begin with, 2-substituted benzimidazoles have been synthesized in proper to high
Saba Rahimi, Ebrahim Soleimani
doaj   +1 more source

1,2,3-Triazole-4(5)-amines – Convenient Synthetic Blocks for the Construction of Triazolo-Annulated Heterocycles

Журнал органічної та фармацевтичної хімії, 2022
Aim. To analyze and summarize the synthetic potential of 1,2,3-triazole-4(5)-amines as efficient building blocks in the synthesis of triazolo-annulated pyridine, azine and azepine systems. Results and discussion.
Natalia O. Syrota, Sergiy V. Kemskiy, Lesya M. Saliyeva, Mykhailo V. Vovk   +3 more
doaj   +1 more source

RhodaMal Dyes: Novel Red Emissive Fluorophores as Probes for High Contrast Live‐Cell Imaging

Chemistry – A European Journal, EarlyView.
Incorporation of malononitrile into the traditional rhodol framework furnishes RhodaMal (Rhoda = Rhodamine, Mal = Malononitrile;) dyes, a new class of red emissive push–pull chromophores. Conjugating them to triphenylphosphonium cation enables live cell super‐resolution STED microscopy with a 775 nm depletion laser.
A. Mavroskoufis, P. Aßmann, L. M. Filla, I. Bilici, E. Quaas, M. Maglione, S. Sigrist, R. Haag, K. Licha   +8 more
wiley   +1 more source