Results 1 to 10 of about 10,732 (222)
Synthesis of new 3-(2-aminothiazol-4-yl)-4-hydroxy-2H-chromen-2-one derivatives [PDF]
Journal of the Serbian Chemical Society, 2006 Aminothiazole derivatives of 4-hydroxy-2H-chromen-2-one were prepared by the Hantzsch reaction1 using 3-(2-bromoacetyl)-4-hydroxy-2H-chromen-2-one and thiourea derivatives.
S. SUKDOLAK +5 more
doaj +5 more sources
Heliyon, 2022 Leishmaniasis, trypanosomiasis, and malaria are a group of neglected tropical diseases present in tropical regions and they affect large numbers of people in developing countries.
José E. Cuellar +4 more
doaj +1 more source
MICROBIOLOGICAL ACTIVITY OF DERIVATIVES 4-CHLORO-7-HYDROXY-CHROMEN-2-ONE COMPARE WITH STANDARD DRUGS [PDF]
European Journal of Materials Science and Engineering, 2019 Nucleophilic substitution and electrophilic of 4-Chloro-7-hydroxy-chromen-2-one are yielded compounds 4-(2,6-Dihydroxy –pyrimidin-4-ylamino )-2-oxo-2H-chromen -3-sulfonyl chloride (1a), {4-[Bis-(2-chloro-ethyl)-amino]-7-hydroxy-2-oxo-2H-chromen-3-yl ...
Aziz BEHRAMI
doaj +1 more source
Metalloradical Approach to 2H-Chromenes [PDF]
Journal of the American Chemical Society, 2014 Cobalt(III)-carbene radicals, generated through metalloradical activation of salicyl N-tosylhydrazones by cobalt(II) complexes of porphyrins, readily undergo radical addition to terminal alkynes to produce salicyl-vinyl radical intermediates. Subsequent hydrogen atom transfer (HAT) from the hydroxy group of the salicyl moiety to the vinyl radical leads
Paul, N.D. +5 more
openaire +5 more sources
Acta Crystallographica Section E: Crystallographic Communications, 2019 The title compounds, 8-amino-6-methyl-3,4-diphenyl-1H-isochromen-1-one, C22H17NO2, (I), and 8-amino-3,4-diethyl-6-methyl-1H-isochromen-1-one, C14H17NO2, (II), are new isocoumarin derivatives in which the isochromene ring systems are planar.
S. Syed Abuthahir +4 more
doaj +1 more source
Organocatalytic Fluorogenic Synthesis of Chromenes [PDF]
Journal of Fluorescence, 2017 Two fluorescent derivatives of 2-amino-3-carbonitrile-4H-chromene were synthesized by means of a fluorogenic Michael addition of dimedone to dicyano alkene labeled BODIPY derivatives. Different organocatalysts were used in different conditions to obtain compounds 3 and 4 in good yield (up to 65% and 85%) and moderate enantiomeric excess (51% and 41% ee,
Raeisolsadati Oskouei, M., Brouwer, A.M.
openaire +4 more sources
Acta Crystallographica Section E: Crystallographic Communications, 2015 In the title compound, C31H22N4O4, the pyrrolidine ring adopts a twist conformation on the N—CH2 bond. The indolin-2-one and the 1H-indole rings are nearly planar (r.m.s.
M. P. Savithri +4 more
doaj +1 more source
Synthesis and cytotoxic evaluation of novel chromenes and chromene(2,3-d)pyrimidines [PDF]
Journal of Applied Pharmaceutical Science, 2020 The synthesis of novel compounds starting from 2-amino-8-(2-chlorobenzylidene)-4-(2-chlorophenyl)-5,6,7,8- tetrahydro-4H-chromene-3-carbonitrile 2 has been studied. Diarylidene cyclohexanone reacts with malononitrile to afford compound 2. Compound 2 reacts with benzoyl chloride to afford compound 3.
Yousif Mahmoud N. M. +4 more
openaire +1 more source
An efficient synthesis of warfarin acetals on montmorillonite clay K-10 with microwaves [PDF]
Journal of the Serbian Chemical Society, 2002 The microwave promoted reaction of warfarin with methanol, or ethanol, in the presence of montmorillonite clay K-10 as a catalyst, affords the corresponding acetals, 2-methoxy 2-methyl-4-phenyl-3,4-dihydro-2H-pyrano[3,2-c]chromen-5-one (2) and 2-ethoxy-2-
Krstić Ljubomir +2 more
doaj +3 more sources
Acta Crystallographica Section E: Crystallographic Communications, 2019 The title compound, C11H8O5·(CH3)2SO, is a new coumarin derivative. The asymmetric unit contains two coumarin molecules (A and B) and two dimethylsulfoxide solvent molecules (A and B).
S. Syed Abuthahir +4 more
doaj +1 more source