Acyl radical cyclizations in synthesis. Part 1. Substituent effects on the mode and efficiency of cyclization of 6-heptenoyl radicals
作者:David Crich、Fortt M. Simon
DOI:10.1016/s0040-4020(01)89534-x
日期:1989.1
The separate, and combined, influences of ether, silyl ether and cyclic ketal groups at positions 3 and 5 on the mode and efficiency of 6-heptenoyl radical cyclizations have been studied with a view to the eventual synthesis of 1α,25-dihydroxyvitamin D3.
Enantioselective Synthesis of Bicyclo[3.1.0]hexane Carbocyclic Nucleosides via a Lipase-Catalyzed Asymmetric Acetylation. Characterization of an Unusual Acetal Byproduct
作者:Yuichi Yoshimura、Hyung R. Moon、Yongseok Choi、Victor E. Marquez
DOI:10.1021/jo020249u
日期:2002.8.1
The bicyclo[3.1.0]hexane scaffold can lock the conformation of a carbocyclic nucleoside into one of the two antipodal (north or south) conformations typical of conventional nucleosides that normally exist in a rapid, two-state equilibrium in solution. In a recent brief communication, we reported a practical method to access the requisite bicyclo[3.1.0]hexane pseudosugar for the north antipode via an
Certain trans-6-[2-(N-heteroaryl-3,5-disubstituted) pyrazol-4-yl)ethyl]- or ethenyl]tetrahydro-4-hydroxy-2H-pyran-2-ones and the corresponding ring-opened acids, esters and N-oxides derived therefrom which are potent inhibitors of the enzyme 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG CoA reductase) and are thus useful hypolipidemic or hypocholesterolemic agents. Pharmaceutical compositions containing such compounds, and a method of inhibiting the biosynthesis of cholesterol employing such pharmaceutical compositions are also disclosed.
Trans-6-(2-(n-heteroaryl-3,5-disubstituted)pyrazol-4-yl)-ethyl- or
申请人:Warner-Lambert Company
公开号:US05102893A1
公开(公告)日:1992-04-07
Certain trans-6-[2-(N-heteroaryl-3,5-disubstituted) pyrazol-4-yl)ethyl]- or ethenyl]tetrahydro-4-hydroxy-2H-pyran-2-ones and the corresponding ring-opened acids, esters and N-oxides derived therefrom which are potent inhibitors of the enzyme 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG CoA reductase) and are thus useful hydrolipidemic or hypocholesterolemic agents. Pharmaceutical compositions containing such compounds, and a method of inhibiting the biosynthesis of cholesterol employing such pharmaceutical compositions are also disclosed.
Preparation of olefinic compounds and intermediates thereof
申请人:Sandoz Corp.
公开号:US04650890A1
公开(公告)日:1987-03-17
7-Substituted lower alkyl hept-6-enoates and 4-hydroxy-tetrahydropyran-2-ones bearing 6-olefinic substituents (E), (Z), ethyl erythro-3,5-dihydroxy-7-phenyl-hept-6-enates are prepared by a multi-step process involving lower alkyl 3,5-dihydroxy-hept-6-enates. The final products are useful as anti hypercholesteremic agents.