Total synthesis of panaxydol and its stereoisomers as potential anticancer agents
摘要:
An efficient total synthesis of natural panaxydol la and its seven stereoisomers 1b-h was accomplished; four diastereomers of the natural form were prepared for the first time. Our strategy involves the Cadiot-Chodkiewicz cross-coupling reaction of chiral terminal alkynes with bromoalkynes, the asymmetric alkynylation of aldehydes, and the enantioselective Sharpless epoxidation of allylic alcohols. Preliminary in vitro cytotoxicity evaluation indicated that some synthetic panaxydols possess anticancer activities, and (3S,9R,10S)-panaxydol 1e showed a particularly promising cytotoxic effect. (C) 2015 Elsevier Ltd. All rights reserved.
Catalytic asymmetric epoxidation and kinetic resolution: modified procedures including in situ derivatization
作者:Yun Gao、Janice M. Klunder、Robert M. Hanson、Hiroko Masamune、Soo Y. Ko、K. Barry Sharpless
DOI:10.1021/ja00253a032
日期:1987.9
The use of 3A or 4A molecularsieves (zeolites) substantially increases the scope of the titanium(IV)-catalyzed asymmetricepoxidation of primary allylicalcohols. Whereas without molecularsievesepoxidations employing only 5 to 10 mol % Ti(O-i-Pr)/sub 4/ generally lead to low conversion or low enantioselectivity, in the presence of molecularsieves such reactions generally lead to high conversion
2,3-epoxy derivatives as anti retrovital chemotherapeutic agents
申请人:The United States of America as represented by the Secretary of the
公开号:US05190969A1
公开(公告)日:1993-03-02
The present invention is related to compounds, compositions and methods of treating viral infections. Compounds of the present invention have the following general formula: ##STR1## wherein R is selected from --CH.sub.2 OH, --CO.sub.2 R.sup.2, --CONR.sup.3 R.sup.4, or COR.sup.5, wherein R.sup.2 is hydrogen or a lower alkyl group, R.sup.3 and R.sup.4 are each independently hydrogen or a lower alkyl group, R.sup.5 is an amino acid residue bound via a terminal nitrogen or peptide having at least two amino acid residues; and wherein R.sup.1 is C.sub.5 -C.sub.13 alkyl, aryl, aralkyl, aralkyl(lower alkyl) ether, or C.sub.5 -C.sub.13 alkyl (lower alkyl)ether.
New Polyacetylenes, DGAT Inhibitors from the Roots of<i>Panax ginseng</i>
作者:Lee, Seung Woong、Kim, Koanhoi、Rho, Mun-Chual、Chung, Mi Yeon、Kim, Young Ho、Lee, Sangku、Lee, Hyun Sun、Kim, Young Kook
DOI:10.1055/s-2004-815534
日期:2004.3
The petroleum ether extract of Panaxginseng showed a significant inhibition of the diacylglycerol acyltransferase (DGAT) enzyme from rat liver microsomes. Bioactivity-guided fractionation led to the isolation of two newpolyacetylenic compounds, (9 R,10 S)-epoxyheptadecan-4,6-diyn-3-one ( 1) and 1-methoxy-(9 R,10 S)-epoxyheptadecan-4,6-diyn-3-one ( 2). Their chemical structures were elucidated on
Alkylative elimination of α,β-epoxy tosylhydrazones
作者:S. Chandrasekhar、Mohamed Takhi、J.S. Yadav
DOI:10.1016/0040-4039(94)02237-6
日期:1995.1
Optically pure allyl alcohols have been prepared from tosylhydrazones derived from chiral epoxy aldehydes by alkylativeelimination utilizing alkyl magnesium reagents.
2,3-epoxy alcohols, acids and derivatives as anti retroviral
申请人:The United States of America as represented by the Department of Health
公开号:US06153589A1
公开(公告)日:2000-11-28
The present invention is related to compounds, compositions and methods of treating viral infections. Compounds of the present invention have the following general formula: ##STR1## wherein R is selected from --CH.sub.2 OH, --CO.sub.2 R.sup.2, --CONR.sup.3 R.sup.4, or COR.sup.5, wherein R.sup.2 is hydrogen or a lower alkyl group, R.sup.3 and R.sup.4 are each independently hydrogen or a lower alkyl group, R.sup.5 is an amino acid residue bound via a terminal nitrogen or peptide having at least two amino acid residues; and wherein R.sup.1 is C.sub.5 -C.sub.13 alkyl, aryl, aralkyl, aralkyl(lower alkyl)ether, or C.sub.5 -C.sub.13 alkyl(lower alkyl)ether.