Use of lipase-catalyzed kinetic resolution for the enantioselective approach toward sesquiterpenes containing quaternary centers: the cuparane family
摘要:
The enzymatic kinetic resolution of a suitable hydroxylated precursor of the deoxygenated molecule 3, a key intermediate in a synthesis of the cuparane skeleton, was investigated by screening a range of lipases for enantioselective transesterification with vinyl acetate. CAL-B proved to be the best lipase, affording both enantiomers in high enantiomeric excess (>98% ee). Single-crystal X-ray diffraction analysis enabled assignment of the absolute configuration and the enantiospecificity of the tested lipases. (C) 2003 Elsevier Ltd. All rights reserved.
The invention provides a compound of Formula (I)
pharmaceutically acceptable salts, pro-drugs, biologically active metabolites, stereoisomers and isomers thereof wherein the variable are defined herein. The compounds of the invention are useful for treating immunological and oncological conditions.
This invention relates to compounds of general Formula (I)
and pharmaceutically acceptable salts thereof, in which R
1
, R
2
, R
2A
, R
2B
, R
3
, R
4
, R
5A
, R
5B
, R
6
, R
7
, R
8
, R
9
, p, q and r are as defined herein, to pharmaceutical compositions comprising such compounds and salts, and to methods of using such compounds, salts and compositions for the treatment of abnormal cell growth, including cancer.
The invention provides compounds of Formula (I) and Formula (II), pharmaceutically acceptable salts, pro-drugs, biologically active metabolites, stereoisomers and isomers thereof wherein the variable are defined herein. The compounds of the invention are useful for treating immunological and oncological conditions.
Lipase-Promoted Access to Phenolic Herbertane-Type Sesquiterpenes: (+)-1,14-Herbertenediol, (?)-?-Herbertenol, (?)-Herbertenediol and Their Enantiomers
An enantioselective synthesis of (+)-1,14-herbertenediol, and a formal enantioselective synthesis of (−)-α-herbertenol and (−)-herbertenediol, employing a lipase-promoted and a key stereoselective alkylation of a cyclopentane unit based methodology, are described. Molecular mechanics considerations that could account for the major role played by the substitution pattern of the benzene nucleus in the
The synthesis of several 1-substitutedcis-bicyclo[3.3.0]octane-3,7-dionederivatives as potentialprecursors of a triquinacene having a pyramidalized C=C bond from ethyl cis-3,7-dioxobicyclo[3.3.0]octane-1-carboxylate is described.