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Journals and Conferences
Multidrug resistance is one of the main obstacles in the chemotherapy of cancer. Its inhibition by combination of chemosensitizers with antitumor compounds is a very active field of research, since safe and potent reversal agents would be beneficial for clinical use. Most modulators act by binding to membrane transport proteins (specially P-gp and MRP) and… (More)
Tryprostatin B was synthesized in 32% overall yield from the readily available dipeptide anhydride cyclo-(l-Trp-l-Pro). Its tandem C-3 prenylation/cyclization gave the corresponding pentacyclic pyrroloindole systems bearing a prenyl group at the indole C-3 position. These compounds were then submitted to acid-catalyzed opening of the newly formed ring, with… (More)
Multicomponent reactions are one of the most interesting concepts in modern synthetic chemistry and, as shown in this critical review, they provide an attractive entry into pyrrole derivatives, which are very important heterocycles from many points of view including medicinal and pharmaceutical chemistry and materials science (97 references).
Treatment of 2,5-diketopiperazines or carbamates derived from tryptophan or tryptamine with iodomethyltrimethylsilane followed by lithium hexamethyldisilazane and a prenyl halide produced stereoselectively derivatives of the hexahydropyrrolo[2,3-b]indole system bearing prenyl substituents both at C-3a and at the indoline nitrogen in a one-pot procedure… (More)
[reaction: see text]. A unique domino reaction of alpha-nitrocycloalkanones with alpha-alkyl alpha,beta-unsaturated aldehydes in aqueous base was discovered, leading to the one-pot synthesis of hitherto unknown functionalized, bridged, bicyclic lactones containing 10-, 11-, 13-, and 15-membered rings. The structures of these heterocyclic compounds,… (More)
A summary of the current status of the application of peptidomimetics in cancer therapeutics as an alternative to peptide drugs is provided. Only compounds that are used in therapy or at least under clinical trials are discussed, using inhibitors of farnesyltransferase, proteasome and matrix metalloproteinases as examples.
The cerium(IV) ammonium nitrate (CAN)-catalyzed sequential, one-pot reaction between alkylamines, beta-ketoesters, and chalcones afforded cis-4,6-disubstituted 2-alkylaminocyclohexene-1-carboxylic esters with complete diastereoselectivity. The carbon-carbon double bond of these compounds was reduced with sodium triacetoxyborohydride, again with complete… (More)
The stereodynamic behavior of a series of pyrazolo[3,4-b]pyridines was studied. The restricted rotations of the aryl substituent in position 4 of the heteroaromatic ring and of the benzoyl group in position 5 generated conformational enantiomers or conformational diastereoisomers depending on the local symmetry of the aryl substituent, with very high… (More)