The stereoselectivesynthesis of methyl spongoate, a naturally occurring new steroid derivative with an unusual C-20 methoxycarbonyl group and potent antitumor activities, was achieved starting from the commercially available pregnenolone acetate in 11% overall yield.
Synthesis of some novel steroidal 1,2,4,5-tetraoxanes
作者:Archana M. Das、Manash P. Hazarika
DOI:10.1039/c5ra00169b
日期:——
A facile synthesis of A-ring manipulated C-20 methyl carboxylate steroid derivative with unsymmetrical dispiro 1,2,4,5-tetraoxanes has been focused herein via acid catalyzed cyclocondensation of bis-epidioxy ketone. Novel stable unsymmetrical steroidal based spirocycloalkane 1,2,4,5 tetraoxane 8 has been developed from 3β-acetoxy-pregn-5(6), 16(17)-diene-20-one (16-dehydropregnenolone acetate, i.e
A series of novel methyl spongoate (1) analogs has been synthesized and evaluated for their in vitro cytotoxic properties. It was found that the nature of the C-20 side chain had significant effects on their bioactivities and some analogs showed higher cytotoxicity than 1 against A549, HCT-116, HepG2, SW-1990, MCF-7 and NCl-H460 tumor cell lines. The pharmacological results confirmed that the alpha,beta-unsaturated carbonyl moiety, a Michael acceptor in ring A, plays a pivotal role in the cytotoxic effect of these derivatives. The compiled pharmacological data may be useful for the design of novel analogous anticancer drugs. (C) 2010 Elsevier Inc. All rights reserved.
�ber Bestandteile der Nebennierenrinde und verwandte Stoffe. 49. Mitteilung. Teilsynthese von Pregnen-(5)-triol-(3?, 17 ?, 21)-on-(20) und Pregnen-(5)-diol-(3?, 17 ?)-on-(20)