Design and synthesis of 2-phenylnaphthalenoids and 2-phenylbenzofuranoids as DNA topoisomerase inhibitors and antitumor agents
摘要:
Eight 2-phenylnaphthalenoids (2PNs) (3a h) and twenty four 2-phenylbenzofuranoids (2PBF5) (4a-4j, 5a-5j, 6a, 6f-6h) were successfully designed, synthesized and their antiproliferative and in vitro DNA topoisomerase inhibitory activities were evaluated. Nine compounds (four 2PNs and five 2PBFs) showed either Topol or TopoII alpha inhibitory activities. Six compounds (four 2PNs and two 2PBFs) exhibited potent cytotoxicity with IC50 values for 72 h exposure ranging from 0.3 to above 20 mu M against MDA-MB-231, MDA-MB-435, HepG2 and PC3 cell lines. The two 2PBFs displayed comparable and even better antiproliferative as well as TopoII alpha inhibitory activities than 2PNs. Interestingly, the active 2PBFs displayed different mechanisms of TopoII alpha inhibition from that of 2PNs, suggesting that the chromophore scaffold replacement may result in a change of the binding site of inhibitors to TopoII alpha. Furthermore, the mechanisms of antiproliferation on MDA-MB-231 cells indicate that compounds 5a and 5f are promising for further development of anticancer agents. The results of this study reveal that the evolutionary strategy of medicinal chemistry through scaffold hopping is a promising strategy for structure optimization of TopoII alpha inhibitors. (C) 2015 Elsevier Masson SAS. All rights reserved.
axially chiral biaryldiols via asymmetric Friedel–Crafts aromatization between p-quinones and 2-naphthols was developed. A chiral cobalt(II) complex of N,N′-dioxide enabled the process to generate axially chiral biaryldiols in up to 98% yield and 95% ee. A large range of substituents at different positions of p-quinones and 2-naphthols was tolerable. The configuration of the product and the chiral N,N′-dioxide-Co(ClO4)2
Herein, we report chiral strong Brønsted acid-catalyzed enantioselective Friedel–Craftsreaction of 2-alkynyphenols with aromatic ethers. The reaction affords the corresponding axially chiral styrenes in up to 91% yield and 97% ee.
在此,我们报道了 2-炔基酚与芳香醚的手性强 Brønsted 酸催化的对映选择性傅克反应。该反应以高达 91% 的收率和 97% ee 提供相应的轴向手性苯乙烯。
Divergent Coupling of <i>ortho</i>-Alkynylnaphthols and Benzofurans: [4 + 2] Cycloaddition and Friedel–Crafts Reaction
Catalytic direct [4 + 2] cycloadditionreactions and Friedel–Crafts reactions of ortho-alkynylnaphthols with benzofurans have been developed, affording functionalized hydrobenzofuro[3,2-b]chromans and hydroarylation products, respectively, in high yields with high chemoselectivity.
Herein, we report a chiral Brønsted acid‐catalyzed enantioselective Friedel‐Craftsreaction of ortho‐alkynylnaphthols with various naphthofurans, realizing the asymmetric synthesis of axially chiral styrenes with naphthofurans in 67 to 93% yield and with 34 to 96% ee.