Long-Wavelength-Absorbing and -Emitting Carbostyrils with High Fluorescence Quantum Yields
摘要:
Synthesis, absorption and fluorescence spectra, as well as quantum yields of a series of donor-acceptor-substituted carbostyrils (= quinolin-2(1H)-ones), are reported. Unprecedented strong absorption maxima (epsilon = 10000-20000) close to the visible spectrum, large Stokes shifts up to 130 nm, and quantum yields up to 0.7 are obtained with derivatives containing donor substituents at C(6) and C(7), and either one Ph substituent at C(3) or one CF3 residue at C(4). For analytical applications in biochemistry and medicine, N(1)-functionalization, or amidoacylation at C(3) in the case of the CF3 derivatives, is possible without a concomitant hypsochromic shift of their absorption and emission maxima. Semiempirical molecular-orbital calculations (AM1 for structures, ZINDO for electronic transition energies) prove to bit a suitable tool for the prediction of absorption properties of these compounds. The crystal-structure analysis of 6,7-dimethoxy-1-methyl-3-nitro-4-(trifluoromethyl)quinolin-2-(1H)-one (7) (C13H11F3N2O5, monoclinic, P2(1)/c, a = 12.372(2), b = 12.154(2), c = 10.119(2)Angstrom, beta = 112.95(2)degrees) shows that the NO2 group, squeezed between the CF3 and the C=O group, is oriented almost perpendicularly (87.8(4)degrees) to the ring plane. The intramolecular F ... N distance between the CF3 and the NO2 group is only 2.513(4)Angstrom.
A series of novel phenothiazinyldihydropyridine dicarboxamides7a–7jwas synthesized by adopting a multi-step synthetic strategy and characterized through physical and spectral techniques.
A novel Cu(TFA)(2)-catalyzed oxidative tandem cyclization/1,2-alkyl migration of readily available enamino amides for the synthesis of pyrrolin-4-ones has been developed. The reaction tolerates a wide range of functional groups and is a reliable method for the rapid synthesis of substituted pyrrolin-4-ones in high yields under mild conditions.
Lions, Journal and Proceedings - Royal Society of New South Wales, 1938, vol. 71, p. 242,248
作者:Lions
DOI:——
日期:——
THE SEARCH FOR SUPERIOR ANTIMALARIALS. II. THE SYNTHESIS OF 6,7-DIMETHOXYQUINOLINE DERIVATIVES AND OF SOME INCIDENTAL COMPOUNDS
作者:KURT C. FRISCH、MARSTON TAYLOR BOGERT
DOI:10.1021/jo01186a006
日期:1944.7
Phenothiazine and amide-ornamented novel nitrogen heterocyclic hybrids: synthesis, biological and molecular docking studies
standard diclofenac sodium. A hybrid integrated with a para-fluorophenyl carboxamide moiety (28) showed the highest DPPH radical scavenging activity among the chemical entities synthesized. Furthermore, the results of anticancer evaluations implied that the hybrid tethered with a phenyl carboxamide structural unit (29) exerted superior activity when compared with other hybrids against the pancreatic cancer