Novel access to 2-substituted quinolin-4-ones by nickel boride-mediated reductive ring transformation of 5-(2-nitrophenyl)isoxazoles
作者:Bernhard Lohrer、Franz Bracher
DOI:10.1016/j.tetlet.2019.151327
日期:2019.12
Reductive ring transformation of 3-substituted 5-(2-nitrophenyl)isoxazoles, readily accessible via 1,3-dipolar cycloaddition of 2-ethinylnitrobenzene with nitriles oxides, opens a novel access to 2-substituted quinolin-4-ones. Nickel boride, generated in situ from nickel chloride and sodiumborohydride, allows, via simultaneous reduction of the nitro group and reductive cleavage of the isoxazole ring, the
A short and divergent route to 2-alkenyl-4-quinolones
作者:Bernhard Lohrer、Franz Bracher
DOI:10.1016/j.tetlet.2018.08.062
日期:2018.10
2-alkenyl-4-quinolones were accessed via a high-yielding, three-stepsynthesis starting from 2-methyl-4-quinolones using a one-pot phosphorylation-olefination sequence as the key step and SEM as a convenient protecting group. This protocol tolerates various functional groups and gives the target olefins with complete (E)-selectivity.
describes the synthesis of 2-phenylvinylquinoline (styrylquinoline) and 2-furanylvinylquinoline derivatives and evaluation for their antiproliferative activities. (E)-2-Styrylquinolin-8-ol (14a) was inactive against a 3-cell line panel consisting of MCF-7 (Breast), NCI-H460 (Lung), and SF-268 (CNS). Replacement of the phenyl ring with 5-nitrofuran-2-yl group significantly enhanced antiproliferative activity
Two new synthetic routes for (E)-N-methyl-2-styryl-4-quinolones have been established, both starting from (E)-2′-cinnamoylaminoacetophenones. In the first, (E)-2′-cinnamoylaminoacetophenones are cyclized and then methylated, while in the second they are methylated followed by in situ cyclization.
Shiga toxin (Stx), a category B biothreat agent, is a ribosome inactivating protein and toxic to human and animals. Here, we designed and synthesized small molecules that block the active site of the Stx A subunit. On the basis of binding energy, 20 molecules were selected for synthesis and evaluation. These molecules were primarily screened using fluorescence-based thermal shift assay and in vitro