Quinine-catalyzed enantioselective tandem conjugate addition/intramolecular cyclization of malononitrile and 1,4-dien-3-ones
作者:Zhi-Peng Hu、Jian Li、Xiao-Gang Yin、Xue-Jing Zhang、Ming Yan
DOI:10.3998/ark.5550190.0014.301
日期:——
An organocatalytic tandemconjugateaddition / intramolecularcyclization of malononitrile and conformationally restricted 1,4-dien-3-ones has been developed. A series of cinchona alkaloids and their derivatives were examined as the catalysts. Quinine was found to be the most efficient catalyst in the absence of any additive. The reaction gave 2-amino-4H-pyrans with high yield and excellent enantiopurity
1,3-Dipolar cycloadditions of nitrile sulphides to 1,4-quinones: a route to novel isothiazolonaphthoquinones and bis-(isothiazolo)benzoquinones
作者:R. Michael Paton、John F. Ross、John Crosby
DOI:10.1039/c39800001194
日期:——
Nitrilesulphides, generated by thermolysis of 1,3,4-oxathiazol-2-ones, react with 1,4-naphthoquinone and 1,4-benzoquinone to yield the isothiazoloquinones (4)–(6).
Compounds containing an isothiazolonaphthoquinone core and HDAC inhibitors with an indolyl-substituted biphenyl-4-yl-acrylohydroxamic acid are promising drug candidates against malignant brain tumors, glioblastomas.
Discovery of a Novel, Isothiazolonaphthoquinone-Based Small Molecule Activator of FOXO Nuclear-Cytoplasmic Shuttling
作者:Bastien Cautain、Francisco Castillo、Loana Musso、Bibiana I. Ferreira、Nuria de Pedro、Lorena Rodriguez Quesada、Susana Machado、Francisca Vicente、Sabrina Dallavalle、Wolfgang Link
DOI:10.1371/journal.pone.0167491
日期:——
FOXO factors are tumour suppressor proteins commonly inactivated in human tumours by posttranslational modifications. Furthermore, genetic variation within the FOXO3a gene is consistently associated with human longevity. Therefore, the pharmacological activation of FOXO proteins is considered as an attractive therapeutic approach to treat cancer and age-related diseases. In order to identify agents capable of activating FOXOs, we tested a collection of small chemical compounds using image-based high content screening technology. Here, we report the discovery of LOM612 (compound 1a), a newly synthesized isothiazolonaphthoquinone as a potent FOXO relocator. Compound 1a induces nuclear translocation of a FOXO3a reporter protein as well as endogenous FOXO3a and FOXO1 in U2OS cells in a dose-dependent manner. This activity does not affect the subcellular localization of other cellular proteins including NFkB or inhibit CRM1-mediated nuclear export. Furthermore, compound 1a shows a potent antiproliferative effect in human cancer cell lines.