A series of new analogs of combretastatin A-4 (CA-4, 1) with the A or B-ring replaced by a 3-oxo-2,3-dihydrofurocoumarin or a furocoumarin residue have been designed and synthesized by employing a cross-coupling approach. All the compounds were evaluated for their cytotoxic activity with respect to model cancer cell lines (CEM-13, MT-4, U-937) using conventional MTT assays. Structure-activity relationship
Plant coumarins: XI. Cross coupling reactions with 2-(tosyl)oreoselone
作者:A. B. Lipeeva、E. E. Shul’ts、M. M. Shakirov、G. A. Tolstikov
DOI:10.1134/s107042801301017x
日期:2013.1
p-toluenesulfonyl chloride gave 2-tosyloreoselone which showed a high reactivity in palladium-catalyzedcross-coupling reactions with formation of a new carbon-carbon bond. 2-Tosyloreoselone reacted with terminalalkynes in the presence of Pd(PPh3)2Cl2 to give the corresponding 2-alkynylfuro[3,2-g]chromen-3-ones. 2-Aryl(hetaryl)alkynyloreoselones were obtained in high yield directly by palladium-catalyzed reaction
Plant coumarins: V. Palladium-catalyzed amination of 2-(1,3-dibromopropan-2-ylidene)oreoselone
作者:A. V. Lipeeva、E. E. Shul’ts、M. M. Shakirov、G. A. Tolstikov
DOI:10.1134/s1070428010120158
日期:2010.12
Palladium-catalyzed amination of 2-(1,3-dibromopropan-2-ylidene)-7H-furo[3,2-g]chromene-3,7(2H)-dione with various amines and amino acid derivatives led to the formation of the corresponding 2-(1,3-diaminopropan-2-ylidene)-substituted oreoselones. The yields depended on the catalytic system, base, and amine structure. Di- and polyazamacrocyclic furocoumarin derivatives were obtained by reactions of 2-(1,3-dibromopropan-2-ylidene)-7H-furo[3,2-g]chromene-3,7(2H)-dione with linear di- and polyamines (hexamethylenediamine, spermine, spermidine, and 3,6-dithiaoctane-1,8-diamine), catalyzed by palladium complexes.
Plant coumarins: VI. Synthesis of 3-vinylfurocoumarin derivatives based on oreoselone
作者:A. V. Lipeeva、E. E. Shul’ts、I. Yu. Bagryanskaya、M. M. Shakirov、G. A. Tolstikov
DOI:10.1134/s1070428011070190
日期:2011.7
Palladium-catalyzed Heck reaction of oreoselone trifluoromethanesulfonate with various terminal alkenes (methyl acrylate, styrene, vinylpyridines, N-vinylpyrrole, and N-vinyl-1,2,4-triazole) led to the formation of the corresponding (E)-3-vinyl-7H-furo[3,2-g]chromen-7-ones. The yield was found to depend on the catalytic system and initial olefin structure.
v. Bruchhausen; Hoffmann, Chemische Berichte, 1941, vol. 74, p. 1584,1591