851856-99-0Relevant articles and documents
TARGETING THE ONCOPROTEIN NUCLEOPHOSMIN
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Page/Page column 81, (2009/07/03)
(+)-Avrainvillamide, a naturally occurring alkaloid with antiproliferative activity, is shown to bind to the oncoprotein nucleophosmin. Nucleophosmin is known to regulate the tumor suppressor protein p53 and is overexpressed in many different human tumors. The invention provides methods of modulating nucleophosmin and p53 using (+)-avrainvillamide and analogues thereof. These compounds may provide leads for the development of novel anti-cancer therapies that target nucleophosmin.
Enantioselective synthesis of stephacidin B
Herzon, Seth B.,Myers, Andrew G.
, p. 5342 - 5344 (2007/10/03)
We describe an enantioselective synthetic route to the antiproliferative alkaloid stephacidin B (1) proceeding in 18 steps and 4.0% yield from 4,4-(ethylenedioxy)-2,2-dimethylcyclohexanone (3). Key features of the synthetic sequence include the use of the Corey-Bakshi-Shibata (CBS) reduction to introduce asymmetry early in the synthetic route, use of the novel electrophile N-(tert-butoxycarbonyl)-5-(isopropylsulfonyloxymethyl)-2,3-dihydropyrrole in a stereoselective enolate alkylation, a diastereoselective Strecker-type addition of hydrogen cyanide to an N-Boc enamine substrate in the solvent hexafluoroisopropanol, platinum-catalyzed nitrile hydrolysis under neutral conditions, cyclization of an acylamino radical intermediate to form the diketopiperazine core of stephacidin B, and implementation of a convergent procedure for introduction of the key 3-alkylidene-3H-indole 1-oxide functional group in the final stage of the route to prepare the structure 2, previously proposed to be the fungal metabolite avrainvillamide (17 steps, 4.2% yield). We observed that synthetic (-)-2 dimerized in the presence of triethylamine to form (+)-stephacidin B (>95%). We also obtained evidence that 2 can form 1 under mild conditions, and that 2 reacts with nucleophiles, such as methanol, by conjugate addition. Copyright
