摘要:
Pharmaceutical compositions are provided for lowering the activity of HMG-CoA reductase and/or lowering serum cholesterol, comprising an amount effective to lower the activity of HMG-CoA reductase and/or lower serum cholesterol of a side chain derivatized 15-oxygenated sterol having the formula (I): ##STR1## the basic ring structure being saturated or unsaturated, wherein R.sub.1 is --OH, .dbd.O, --OR.sub.7, ##STR2## a sulfate group, a sugar moiety, or a Mg, Na, or K salt of a sulfate group;R.sub.2 is --H, --OH, .dbd.O, mono- or di-halogen, or a C.sub.1 to C.sub.6 alkyl group, which may be unsaturated or substituted with halogen;R.sub.3 is --H, --OH, halogen, or a C.sub.1 to C.sub.6 alkyl group, which may be unsaturated or substituted with halogen;R.sub.4 is nonexistent when there is a double bond between the 8 and 14 carbons or .alpha.H, .beta.H, or an .alpha.C.sub.1 to C.sub.6 alkyl group;R.sub.5 is --OH, .dbd.O, .dbd.NOH, or ##STR3## R.sub.6 is --CH.sub.2 CH(CH.sub.3).sub.2 or CH.sub.2 N(CH.sub.3).sub.2, in which one or more of the hydrogen atoms is replaced by OH or halogen;R.sub.7 is a C.sub.1 to C.sub.6 alkyl group;R.sub.8 is a C.sub.1 to C.sub.20 aliphatic group, which may be substituted or unsubstituted, or a phenyl group; andn is an integer of from 2 to 6; andoptionally a pharmaceutically acceptable carrier or excipient, with the proviso that R.sub.6 is not --CH.sub.2 CH(CH.sub.3)(CH.sub.2 OH). Methods of using the pharmaceutical compositions containing the side chain derivatized 15-oxygenated sterols are also provided.A new process is also provided for preparing side chain derivatized 15-oxygenated sterols. This process includes oxidative cleavage of the saturated side chain of the sterol with trifluoroperacetic acid to give a side chain trifluoroacetate and subsequent hydrolysis of this ester. The resultant side chain alcohol is a valuable and advanced intermediate for the preparation of side chain derivatives of 15-oxygenated sterols.