Showing papers by "Andrey V. Gerasimenko published in 2001"
TL;DR: Two new cytotoxic tetrabromodibenzo-p-dioxins were isolated from an Australian marine sponge Dysidea dendyi and established by 1D and 2D NMR spectroscopy, X-ray analysis, and synthesis of the methyl ether of spongiadioxin B from diphenyl ether isolated from dysidea herbacea.
Abstract: Two new cytotoxic tetrabromodibenzo-p-dioxins, spongiadioxins A (1) and B (2), were isolated from an Australian marine sponge Dysidea dendyi. The structures of these compounds were established by 1D and 2D NMR spectroscopy, X-ray analysis of the methyl ether of spongiadioxin A (3), and synthesis of the methyl ether of spongiadioxin B (4) from diphenyl ether (9) isolated from Dysidea herbacea.
61 citations
35 citations
TL;DR: A pentacyclic tritepenoid, 3β-methoxyolean-18-ene (miliacin), was isolated for the first time from the marine fungus Chaetomium olivaceum as discussed by the authors.
Abstract: A pentacyclic tritepenoid, 3β-methoxyolean-18-ene (miliacin), was isolated for the first time from the marine fungus Chaetomium olivaceum. Its structure was determined on the basis of 2D NMR spectroscopy and X-ray diffraction data.
11 citations
TL;DR: In this paper, single crystals of NH4NaTiF6 are studied by X-ray diffraction analysis (automated diffractometer, MoKαradiation, graphite monochromator, sin θ/λ ≤ 1.0 A−1, 1566 reflections with I> 3σ(I ), anisotropic least squares method to R= 0.045 and Rw=0.040).
Abstract: Single crystals of NH4NaTiF6are studied by X-ray diffraction analysis (automated diffractometer, MoKαradiation, graphite monochromator, sin θ/λ ≤ 1.0 A–1, 1566 reflections with I> 3σ(I ), anisotropic least squares method to R= 0.045 and Rw= 0.040). The compound belongs to the NaRbSnF6structural type. The types of internal motions of the complex ions NH4+and TiF62–are determined in the temperature range 200–500 K and compared with the motion of ionic groups in (NH4)2TiF6and Na2TiF6crystals.
4 citations
TL;DR: Tricyclo[7.1.2.1] was synthesized by dehydration of the corresponding hydroxy ketone and was brought into the Leuckart reaction.
Abstract: Tricyclo[7.2.1.02,7]dodec-2(7)-en-12-one was synthesized by dehydration of the corresponding hydroxy ketone and was brought into the Leuckart reaction. The resulting N-tricyclo[7.2.1.02,7]dodec-2(7)-en- 12-ylformamide was hydrolyzed to 12-aminotricyclo[7.2.1.02,7]dodec-2(7)-ene and was converted into 2,7-epoxy derivative. The structure of the latter was determined by X-ray analysis. Hydrolysis of the amide group gave 12-amino-2,7-epoxytricyclo[7.2.1.02,7]dodecane. The stereochemistry of hydroamination of the bridging carbonyl group is discussed.
2 citations