Stereoselective Syntheses of Rolliniastatin 1, Rollimembrin, and Membranacin
摘要:
A radical cyclization of beta-alkoxyvinyl sulfoxides-Pummerer rearrangement-allylation protocol was successfully applied to the synthesis of the threo/cis/threo/cis/erythro bis-oxolane moiety in rolliniastatin 1 (1), rollimembrin (2), and membranacin (3).
Determination of absolute configuration of stereogenic carbinol centers in annonaceous acetogenins by proton and fluorine 19-NMR analysis of Mosher ester derivatives
作者:Matthew J. Rieser、Yu Hua Hui、J. Kent Rupprecht、John F. Kozlowski、Karl V. Wood、Jerry L. McLaughlin、Paul R. Hanson、Zhiping Zhuang、Thomas R. Hoye
DOI:10.1021/ja00052a018
日期:1992.12
The absolute configuration of the stereogenic carbinolcenters in nine annonaceous acetogenins has been determined by careful 1 H- and 19 F-NMR analysis of (S)- and (R)-Mosher ester [methoxy(trifluoromethyl)phenylacetate or MTPA] derivatives. These acetogenins include five adjacent bis-tetrahydrofuran acetogenins [uvaricin (3), bullatacin (4), bullatacinone (5), asimicin (6), and rolliniastatin 1 (7)]
New method for the determination of the absolute stereochemistry in antitumoral annonaceous acetogenins
作者:M. Carmen González、Catherine Lavaud、Teresa Gallardo、M. Carmen Zafra-Polo、Diego Cortes
DOI:10.1016/s0040-4020(98)00301-9
日期:1998.5
several acetogenins were determined through p-bromophenylurethane derivatives and subsequent Mosher ester methodology. This method has been applied on α,α′-dihydroxylated adjacent bis-THF acetogenins with a threo/cis/threo/cis/erythro relative configuration membrarollin (1), a new acetogenin isolated from Rollinia membranacea seeds, rollimembrin (2), membranacin (3) and rolliniastatin-1 (4), and a th
Semisynthesis of Antitumoral Acetogenins: SAR of Functionalized Alkyl-Chain Bis-Tetrahydrofuranic Acetogenins, Specific Inhibitors of Mitochondrial Complex I
作者:Teresa Gallardo、M. Carmen Zafra-Polo、José R. Tormo、M. Carmen González、Xavier Franck、Ernesto Estornell、Diego Cortes
DOI:10.1021/jm000911j
日期:2000.12.1
and squamocin. Our results suggest a double binding point of acetogenins to the enzyme involving the alpha,alpha'-dihydroxylated tetrahydrofuranic system as well as the alkyl chain that links the terminal alpha, beta-unsaturated-gamma-methyl-gamma-lactone. The former mimics and competes with the ubiquinone substrate. The latter modulates the inhibitory potency following a complex outline in which multiple
Analogues of cytotoxic squamocin using reliable reactions: new insights into the reactivity and role of the α,β-unsaturated lactone of the annonaceous acetogenins
作者:Romain A. Duval、Erwan Poupon、Vanessa Romero、Eva Peris、Guy Lewin、Diego Cortes、Ulrich Brandt、Reynald Hocquemiller
DOI:10.1016/j.tet.2006.04.066
日期:2006.6
A small library of squamocin analogues has been prepared and screened biologically (cytotoxicity, inhibition of mitochondrial complex I and complex III). To centre diversity on a crucial part of the molecule (i.e., the alpha.beta-unsaturated lactone), an original and reliable lactone opening reaction has been discovered and exploited among other efficient reactions. (c) 2006 Elsevier Ltd. All rights reserved.
Alteration of the Bis-tetrahydrofuran Core Stereochemistries in Asimicin Can Affect the Cytotoxicity
作者:Subhash C. Sinha、Zhiyong Chen、Zheng-Zheng Huang、Eiko Nakamaru-Ogiso、Halina Pietraszkiewicz、Matthew Edelstein、Frederick Valeriote
DOI:10.1021/jm801028c
日期:2008.11.27
A systematic analysis using 10 synthetic asimicin stereoisomers revealed that the stereochemistry of the bis-tetrahydrofuran core, including the tetrahydrofuran rings and the adjacent hydroxy functions, had significant effect on its cytotoxicity. Our findings set to rest the highly controversial perception that the stereochemistry of the tetrahydrofuran core has little effect on the activity, which is not true for its cytotoxic effect, and also reinforces the previous conclusion that asimicin is a highly potent anticancer compound.