developed using a guanidine–urea bifunctional catalyst lacking C2 symmetry, which was designed based upon the insights obtained from the DFT calculation model for our previous C2symmetric catalyst. The present organocatalytic reaction provides access to a variety of optically active naphthoquinone epoxides bearing aryl and methyl substituents at C2 and C3 in high yields with high enantioselectivities (up
Iron-catalyzed regioselective alkylation of 1,4-quinones and coumarins with functionalized alkyl bromides
作者:Dengke Li、Xianfu Shen
DOI:10.1039/c9ob02289a
日期:——
A simple and efficient Fe-catalyzed regioselectivealkylation of 1,4-quinones and coumarins, using functionalized alkyl bromides as alkylating reagents, has been developed. The reaction proceeds under mild conditions with the addition of alkyl bromides to a wide range of 1,4-quinone and coumarin derivatives with a broad substrate scope and wide functional group tolerance to provide the products in
of the redox potentials that correlated with the redox cycling of both targets in the coupled assay. Our approach demonstrates that the antimalarial activity of 3‐benz(o)ylmenadiones results from a subtle interplay between bioactivation, fine‐tuned redox properties, and interactions with crucial targets of P. falciparum. Plasmodione and its analogues give emphasis to redoxpolypharmacology, which constitutes
methodology is compatible with a wide variety of diversely substituted 1,4-naphthoquinones as well as various cheap, readily available benzyl bromides with excellent functional group tolerance. The benzylation mechanism was investigated and supports a three-step radical cascade with the key involvement of the photogenerated superoxide anion radical.
1,4-NAPHTHOQUINONES DERIVATIVES AND THERAPEUTIC USE THEREOF
申请人:Davioud-Charvet Elisabeth
公开号:US20110059972A1
公开(公告)日:2011-03-10
1,4 naphthoquinones derivatives, of formula (I)
wherein A is selected from the following rings:
their preparation and their application as antimalarial agents