Substituent-Enabled Oxidative Dehydrogenative Cross-Coupling of 1,4-Naphthoquinones with Alkenes
摘要:
A Rh-catalyzed oxidative dehydrogenative cross-coupling of 1,4-naphthquinones with alkenes was achieved by using a substituent-enabled C(sp(2))-H functionalization (SEF) strategy. The method shows high functional group tolerance, broad substrate scope, and great potential for further functional transformations.
Synthesis, reactive oxygen species generation and copper-mediated nuclease activity profiles of 2-aryl-3-amino-1,4-naphthoquinones
摘要:
Here we report a series of 2-aryl-3-amino-1,4-naphthoquinones that generated reactive oxygen species (ROS) such as superoxide and hydrogen peroxide upon incubation in pH 7.4 under ambient aerobic conditions. ROS generation from these compounds was sensitive to structural modifications at the 3-amino position and a 2-aryl substituent promoted ROS generation. A number of these compounds were found to induce DNA damage in the presence of Cu(II) without any added reducing agent. Our data suggests that 2-aryl-3-amino-1,4-naphthoquinones' propensity to produce ROS correlated well with its DNA damage inducing ability. 2-Phenyl-3-pyrrolid-1-yl-1,4-naphthoquinone (22) was found to damage DNA at 1 mu M suggesting that these compounds may have therapeutic relevance in targeting cancers which over-express Cu(II) (C) 2012 Elsevier Ltd. All rights reserved.
One-potsynthesis of tetracyclic naphthoxazole derivatives from electron-deficient naphthoquinones and alkynes was achieved via Rh(III)-catalyzed C–Hactivation and Csp3–H bond cleavage for the first time. This approach proceeds through a tandem cascade process involving substrate tautomerization, C–Hactivation, oxidative addition, cyclization, and aromatization. In addition, broad substrate scope