Results 171 to 180 of about 17,166 (251)

One Stone, Three Birds: One-Pot Synthesis of Pyrido[3,2-a]phenoxazin-5-one Derivatives from o-Aminophenols with Triple Roles, Paraformaldehyde, and Enaminones via the Povarov Reaction.

Journal of Organic Chemistry, 2023
A novel multicomponent cascade cyclization reaction in one pot for the preparation of pyrido[3,2-a]phenoxazin-5-ones from simple o-aminophenols, paraformaldehyde, and enaminones has been established.
Shuang-Gui Lei, You Zhou, Li-Sheng Wang, Zhiwei Yu, Ting Chen, Yan‐Dong Wu, M. Gao, A. Wu   +7 more
semanticscholar   +1 more source

Amidino substituted 2-aminophenols: biologically important building blocks for the amidino-functionalization of 2-substituted benzoxazoles.

Organic and biomolecular chemistry, 2021
Unlike the closely related and widely investigated amidino-substituted benzimidazoles and benzothiazoles with a range of demonstrated biological activities, the matching benzoxazole analogues still remain a largely understudied and not systematically ...
Lucija Ptiček, L. Hok, Petra Grbčić, F. Topić, M. Cetina, K. Rissanen, S. K. Pavelić, R. Vianello, L. Racané   +8 more
semanticscholar   +1 more source

2-Aminophenols based Schiff bases as fluorescent probes for selective detection of cyanide and aluminium ions - Effect of substituents.

Spectrochimica Acta Part A - Molecular and Biomolecular Spectroscopy, 2020
Three Schiff base based probes are designed and synthesized by facile condensation of a commercially available fluorophore 2,6-diformyl-4-tert-butylphenol with 4-nitro-2-aminophenol (KP1), 2-aminophenol (KP2) and 4-tert-butyl-2-aminophenol (KP3) and are ...
K. Poongodi, P. Saravana Kumar, R. Shanmugapriya, C. Nandhini, K. Elango   +4 more
semanticscholar   +1 more source

Statistical design of experiments for production and purification of vanillin and aminophenols from commercial lignin

, 2020
Lignin is a complex polyphenolic substance that collectively represents the largest renewable source of aromatic carbon on Earth. Despite low yield and purity from depolymerized lignin, bio-derived vanillin (4-hydroxy-3-methoxybenzaldehyde) is a ...
Shih-Miao Liu, Lalitendu Das, D. Blauch, C. Veronee, Chang Dou, J. Gladden, N. Sun, A. Socha   +7 more
semanticscholar   +1 more source

Controllable synthesis of 2- and 3-aryl-benzomorpholines from 2-aminophenols and 4-vinylphenols.

Chemical Communications, 2020
We present herein a method for the controllable synthesis of 3-aryl-benzomorpholine and 2-aryl-benzomorpholine cycloadducts via cross-coupling/annulation between electron-rich 2-aminophenols and 4-vinylphenols.
Kui Dong, Xiao‐Ling Jin, Shihao Chen, Lizhu Wu, Qiang Liu   +4 more
semanticscholar   +1 more source

Formation of 3-Aminophenols from Cyclohexane-1,3-diones.

Journal of Organic Chemistry, 2020
meta-Aminophenols are formed by the action of DBU on 3-amino-2-chlorocyclohex-2-en-1-ones at room temperature in MeCN. The chloro compounds are generated by treating 3-aminocyclohex-2-en-1-ones with the easily prepared halogenating agent BnNMe3·ICl2 in ...
Damian Szymor-Pietrzak, M. N. Khan, A. Pagès, Ajay Kumar, Noah Depner, D. Clive   +5 more
semanticscholar   +1 more source

Synthesis, structure and diverse coordination chemistry of cobalt(III) complexes derived from a Schiff base ligand and their biomimetic catalytic oxidation of o-aminophenols

Polyhedron, 2019
This paper deals with the syntheses and structural characterizations of four new cobalt(III) compounds (1–4) derived from a N3O donor Schiff base ligand and their catalytic activity towards the aerobic oxidation of o-aminophenols.
N. Jana, M. Patra, P. Brandão, A. Panja
semanticscholar   +1 more source

Cobalt-Catalyzed Aerobic Oxidative Cyclization of 2-Aminophenols with Isonitriles: 2-Aminophenol Enabled O2 Activation by Cobalt(II).

Organic Letters, 2019
An aerobic cobalt-catalyzed oxidative cyclization of 2-aminophenols and isonitriles is reported. These additive-free conditions furnish a variety of substituted 2-aminobenzoxazoles in moderate to excellent yields.
Jiaqi Liu, J. Hoover
semanticscholar   +1 more source

Acid-Catalyzed Condensation of o-Phenylenediammines and o-Aminophenols with α-Oxodithioesters: A Divergent and Regioselective Synthesis of 2-Methylthio-3-aryl/Heteroarylquinoxalines and 2-Acylbenzoxazoles

Synthesis, 2019
o-Phenylenediammines and o-aminophenols were reacted with α-oxodithioesters in a highly regioselective fashion to give 2-methylthio-3-aryl/heteroarylquinoxalines and 2-acylbenzoxazoles in 55–94% and 45–86%, respectively, in the presence of p-toluene ...
K. R. Kiran, T. Swaroop, Kodipura P. Sukrutha, Jeegundipattana B. Shruthi, S. M. Anil, K. Rangappa, M. P. Sadashiva   +6 more
semanticscholar   +1 more source

Ready N-alkylation of enantiopure aminophenols: synthesis of tertiary aminophenols

Tetrahedron, 2001
Abstract A regioselective indirect alkylation of aminophenols to enantiopure tertiary aminophenols, which are useful chiral ligands for metal-catalysed asymmetric reactions, is reported. This very simple synthetic methodology, through reduction or alkylation of an intermediate benzoxazine, was performed in mild conditions, suitable for the ...
CIMARELLI, Cristina, PALMIERI, Gianni, VOLPINI E.   +2 more
openaire   +1 more source