69015-75-4Relevant academic research and scientific papers
DUAL EMISSION FLUORESCENT COMPOUNDS
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Page/Page column 44; 45, (2017/09/19)
The invention relates to a dual emission fluorescent compound comprising a chromophore suitable for exhibiting an emission at a first wavelength from an excited state; wherein the compound further comprises one or more groups suitable for inducing a structural rearrangement in the molecule on formation of the excited state, wherein the structural rearrangement stabilises at least a second electromagnetic emission at a second wavelength, such that dual emission is observable at room temperature. Such dual emission allows for the super sensitive ratiometric quantification of analytes.
A catalytic asymmetric hetero-Diels-Alder reaction of olefinic azlactones and isatins: Facile access to chiral spirooxindole dihydropyranones
Gao, Tai-Ping,Lin, Jun-Bing,Hu, Xiu-Qin,Xu, Peng-Fei
supporting information, p. 8934 - 8936 (2014/08/05)
A catalytic asymmetric hetero-Diels-Alder (HDA) reaction has been achieved through hydrogen-bond directed γ-addition of olefinic azlactones to isatins. This methodology provides an efficient access to spirooxindole dihydropyranones in moderate to good yie
Novel synthesis of unsaturated 5(4H)-oxazolone derivatives with using palladium(II) acetate as a catalyst and microvawe irradiation in solvent-free condition
Hamidian, Hooshang,Tikdari, Ahmad Momeni
, p. 29 - 34 (2007/10/03)
Unsaturated 5(4H)-oxazolones have emerged as an important class of synthons. These compounds have prepared with using palladium(II) acetate under free-solvent conditions with excellent yields and microwave irradiation.
An efficient and stereodivergent synthesis of threo- and erythro-β-methylphenylalanine. Resolution of each racemic pair by semipreparative HPLC
Alías, Miriam,López, María Pilar,Cativiela, Carlos
, p. 885 - 891 (2007/10/03)
threo and erythro diastereoisomers of the constrained amino acid (βMe)Phe can be obtained separately on a multigram scale through a three-step synthesis from the corresponding Z and E isomers of 2-phenyl-4(α-phenylethylidene)-5(4H)-oxazolone. The 5(4H)-ox
On the Synthesis of Geometric Isomers of 2-Methyl (or Phenyl)-4--5(4H)-oxazolones
Cativiela, C.,Diaz de Villegas, M. D.,Melendez, E.
, p. 1655 - 1657 (2007/10/02)
Several Z-2-methyl(or phenyl)-4--5(4H)-oxazolones 3Z, 4Z were prepared.The results obtained were compared by diazomethane insertion and condensation procedure.In order to synthetize E-2-phenyl-4--5-(4H)-oxazolones 4E hy
Reaction of 4-Methylene-5(4H)-oxazolones With Diazomethane
Arenal, I.,Bernabe, M.,Alvarez, E. Fernandez,Izquierdo, M. L.,Penades, S.
, p. 607 - 614 (2007/10/02)
The reaction of diazomethane with some (E) and (Z)-2-substituted-4-methylene-5(4)-oxazolones (1a-c) under two different conditions, has been studied. (E) and (Z)-1,2-disubstituted-7-oxo-6-oxa-4-azaspiro-hept-4-enes (3a-c, 4a-c) were mainly obtained, together with multiple addition compounds.The reaction showed to be stereoselective only when the substituents were aromatic.Acid hydrolysis of compounds 3a and 4a produced a mixture of (E) and (Z)-3,5-disubstituted-tetrahydrofuran-2-ones (8a, 9a).Smooth methanolysis of the ring led to (E) and (Z)-1-benzamido-cyclopropanecarboxylic esters (10a-c, 11a-c), which, on acid hydrolysis, gave (E) and (Z)-1-amino-2-phenylcyclopropanecarboxylic acids 12a and 13a.The pmr spectra have been analyzed by an iterative computer method, and the computed best values obtained have been used to deduce the stereochemistry of the spiroderivatives.
