22489-66-3Relevant academic research and scientific papers
Phenylthio-derivatives of α-methylene-γ-lactones as pro-drugs of cytotoxic agents
Fardella, Giuseppe,Barbetti, Paolo,Grandolini, Giuliano,Chiappini, Ione,Ambrogi, Valeria,Scarcia, Vito,Furlani Candiani, Ariella
, p. 515 - 523 (2007/10/03)
A series of substituted phenylthio-derivatives of grosheimin (1), a natural cytotoxic guaianolide, were investigated with the aim of providing insight into their mechanism of action as cytotoxic agents against KB cell lines. Hydrolysis data, kinetics, in the presence and in the absence of H2O2, and the valuation of lipophilicity were correlated with cytotoxicity values and with Hammett-σ-values of substituents (R) at the thiophenol ring. These compounds behave as 'pro-drugs' which release the cytotoxic agent grosheimin by sulphur-oxidation promoted by H2O2 and subsequent retro- elimination which depends on the nature and position of the R substituent.
Studies on Sesquiterpene Glycosides from Crepis japonica BENTH.
Miyase, Toshio,Ueno, Akira,Noro, Tadataka,Kuroyanagi, Masanori,Fukushima, Seigo
, p. 4451 - 4456 (2007/10/02)
Nine new guaianolide-type glycosides, crepisides A(II), B(III), C(IV), D(V), E(VI), F(VII), G(VIII), H(IX) anf I(X), have been isolated from Crepis japonica BENTH., together with a known glycoside, glucozaluzanin C(I).The structures of II-X were established on the basis of chemical and spectral data.Keywords - Crepis japonica; Compositae; sesquiterpene glycoside; guaianolide; crepiside
SESQUITERPENIC LACTONES FROM Grossheimia macrocephala. STRUCTURE OF GROSHEIMINOL
Daniewski, Wlodzimierz,Wawrzun, Andrzej,Bloszyk, Elzbieta,Drozdz, Bohdan,Holub, Miroslav
, p. 3160 - 3163 (2007/10/02)
From the leaves of Grossheimia macrocephala (MUSS.-PUSCHK.) D.SOSN. et TAKHT. cynaropicrin (II), isolipidiol (III) and the so far undescribed lactone grosheiminol (IV) were isolated in addition to grosheimin (I), detected in this species earlier.For grosheiminol the structure IV was derived, including relative and absolute configuration, on the basis of chemical correlation.
