Results 21 to 30 of about 913 (183)

A comparative study of bridged 1,2,4-oxazolones and their derivatives

Energetic Materials Frontiers, 2020
For energetic compounds, a slight difference in their molecular structures can result in a tremendous difference in their properties. Compounds with similar structures but exhibiting big difference in their physicochemical properties (such as density and
Teng Fei, Chenghui Sun, Chunlin He, Siping Pang   +3 more
doaj   +1 more source

Some novel hybrid quinazoline-based heterocycles as potent cytotoxic agents

Research in Pharmaceutical Sciences, 2022
Background and purpose: In this study, some new cytotoxic hybrid structures were synthesized by combining pyrazolinone and imidazolinone rings with quinazoline pharmacophores. Experimental approach: The benzoxazinone, pyrazolo-quinazoline fused ring, and
Mahla Malekzadeh, Shadi Dadkhah, Ghadam Ali Khodarahmi, Parvin Asadi, Farshid Hassanzadeh, Mahboubeh Rostami   +5 more
doaj   +1 more source

Multicomponent Domino Cyclization of Ethyl Trifluoropyruvate with Methyl Ketones and Amino Alcohols as A New Way to γ-Lactam Annulated Oxazacycles

Molecules, 2023
A new route to bicyclic γ-lactams was found, which was proposed as a three-component cyclization of ethyl trifluoropyruvate with methyl ketones and 1,2-, 1,3-amino alcohols.
Marina V. Goryaeva, Olesya A. Fefelova, Yanina V. Burgart, Marina A. Ezhikova, Mikhail I. Kodess, Pavel A. Slepukhin, Vasily S. Gaviko, Victor I. Saloutin   +7 more
doaj   +1 more source

A Novel Synthesis of 4-Acetoxyl 5(4H)-Oxazolones by Direct α-Oxidation of N-Benzoyl Amino-Acid Using Hypervalent Iodine

Molecules, 2017
We have developed a new method to prepare 4-acetoxy substituted 5(4H)-oxazolones by direct oxidation of N-benzoyl amino-acids using hypervalent iodine.
Gang Wen, Wen-Xuan Zhang, Song Wu
doaj   +1 more source

Oxidation of mesoionic oxazolones by oxygen [PDF]

, 1991
The reaction of molecular oxygen with several 2,4-disubstituted oxazolones (3a-3g) is studied in the present paper. It is shown that oxygen may induce oxidative dimerization to dehydrodimers (7a-7g) via the mesoionic form of the oxazolone.
C.A Chuaqui, Marquez, A., Gomez, B., Chuaqui, C. A., H Rodriguez, Rodriguez, H., B Gomez, A Marquez   +7 more
core   +1 more source

Synthetic scope and DFT analysis of the chiral binap–gold(I) complex-catalyzed 1,3-dipolar cycloaddition of azlactones with alkenes

Beilstein Journal of Organic Chemistry, 2013
The 1,3-dipolar cycloaddition between glycine-derived azlactones with maleimides is efficiently catalyzed by the dimeric chiral complex [(Sa)-Binap·AuTFA]2.
María Martín-Rodríguez, Luis M. Castelló, Carmen Nájera, José M. Sansano, Olatz Larrañaga, Abel de Cózar, Fernando P. Cossío   +6 more
doaj   +1 more source

Heterocycles 36. Single-Walled Carbon Nanotubes-Bound N,N-Diethyl Ethanolamine as Mild and Efficient Racemisation Agent in the Enzymatic DKR of 2-Arylthiazol-4-yl-alanines

Molecules, 2015
In this paper we describe the chemoenzymatic synthesis of enantiopure l-2-arylthiazol-4-yl alanines starting from their racemic N-acetyl derivatives; by combining the lipase-catalysed dynamic kinetic resolution of oxazol-5(4H)-ones with a chemical and an
Denisa Leonte, László Csaba Bencze, Csaba Paizs, Monica Ioana Toşa, Valentin Zaharia, Florin Dan Irimie   +5 more
doaj   +1 more source

Synthesis of New 4(3H)-Quinazolinone Derivatives Using 5(4H)-Oxazolones

Molecules, 2006
New derivatives of 5(4H)-quinazolinone containing 2-imidazolin-5-one rings have been prepared from 5(4H)-oxazolone derivatives.
Hojatollah Khabazzadeh, Ahmad Momeni Tikdari, Hooshang Hamidian   +2 more
doaj   +1 more source

Solid Phase Synthesis of (Benzannelated) Six-Membered Heterocycles via Cyclative Cleavage of Resin-Bound Pseudo-Oxazolones

, 2016
A solid supported procedure for the synthesis of benzoxazinones, dihydropyrazinones, quinoxalinones, and dihydrooxazinones using immobilized oxazolones in combination with difunctional nucleophiles as cleavage agent is presented.
Sylvia Vanderheiden (2870681), Stefan Bräse (1457791), Martin Nieger (1628914), Simone Gräßle (1843411), Nicole Jung (1843408), Bekir Bulat (2870678), Patrick Hodapp (2870684)   +6 more
core   +1 more source

Palladium-Catalyzed Diastereo- and Enantioselective Allylic Alkylation of Oxazolones with 1,3-Dienes Under Base-Free Conditions [PDF]

, 2020
Herein, we report a highly diastereo- and enantioselective allylic alkylation of oxozolones with 1,3-dienes by palladium-hydride catalyst under base-free conditions.
Dong Xing (5736110), Dong, Xing, Haijian, Yang, Haijian Yang (5737275)   +3 more
core   +2 more sources