- Candida antarctica lipase B catalyzes the regioselective esterification of ecdysteroids at the C-2 OH
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Immobilized Candida antarctica lipase B (Novozym 435) catalyzes the regioselective acylation of 20R-hydroxyecdysone (1a) and its congeners 2a, 3a and 4a at the C-2 OH in high yield and purity.
- Danieli, Bruno,Lesma, Giordano,Luisetti, Monica,Rivo, Sergio
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- Natural product derivatives as food supplements and pharmaceuticals
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Then present invention provides new and useful derivatives of phyto-derived tetracyclic compounds possessing steroidal-like activity, and in some instances both amino acid/oligo-peptide and steroidal-like activity, uses thereof and methods of production.
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Page/Page column 60
(2008/06/13)
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- Selective Acetylation of 20-Hydroxyecdysone. Partial Synthesis of Some Minor Ecdysteroids and Analogues
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Selective acetylation of the 2,3- and 20,22-acetonide and 2,3:20,22-diacetonide derivatives of 20-hydroxyecdysone and subsequent removal of the protecting groups led to partial synthesis of a number of mono-, di- and triacetate derivatives of 20-hydroxyecdysone.Some of these acetate derivatives are minor, naturally occurring ecdysteroids.
- Suksamrarn, Apichart,Pattanaprateep, Prasert
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p. 10633 - 10650
(2007/10/02)
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- Studies on constituents of fruit body of Polyporus umbellatus and their cytotoxic activity
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From the crude drug Chorei, the fruit body of Polyporus umbellatus, seven new components named polyporusterone A. B, C, D, E, F and G, were isolated and their structures were determined on the basis of the spectral data. These compounds showed cytotoxic action on leukemia 1210 cell proliferation.
- Ohsawa,Yukawa,Takao,Murayama,Bando
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p. 143 - 147
(2007/10/02)
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