Iron (III) salts (perchlorate and nitrate nonahydrate) in acetonitrile or acetic anhydride at 0–50°C oxidize the ∝-position of malonic esters efficiently via the corresponding radicals. In the presence of olefins and aromatics, inter- and intramolecular free radical chain or oxidative additions are observed.
Die Oxidation der ω‐Phenylalkylmalonsäurederivate 1a‐f führt nicht nur zu Cyclisierungsprodukten 2, sondern auch zu offenkettigen Nitro‐, Alkohol‐ und Acetoxyderivaten 3–7. Es wird eine empfindliche Abhängigkeit der Produktverteilung von Reaktionstemp. und Wassergehalt des Reaktionsmediums sowie der Natur der Carbonylgruppen beobachtet. Das während der Reaktion entstehende Ce3+‐Ion ist für die Entstehung
The present invention provides a pharmaceutical agent having cholesteryl ester transfer protein inhibitory action and useful as a blood lipid lowering agent and the like. The present invention relates to a compound represented by the formula
1
wherein Ar
1
is an aromatic ring group optionally having substituents, Ar
2
is an aromatic ring group having substituents, OR″ is an optionally protected hydroxyl group, R is an acyl group, R′ is a hydrogen atom or a hydrocarbon group optionally having substituents, or a salt thereof, and a pharmaceutical composition containing a compound of the formula (I) or a salt thereof or a prodrug thereof.
The present invention provides a pharmaceutical agent having cholesteryl ester transfer protein inhibitory action and useful as a blood lipid lowering agent and the like. The present invention relates to a compound represented by the formula
wherein Ar1 is an aromatic ring group optionally having substituents, Ar2 is an aromatic ring group having substituents, OR'' is an optionally protected hydroxyl group, R is an acyl group, R' is a hydrogen atom or a hydrocarbon group optionally having substituents, or a salt thereof, and a pharmaceutical composition containing a compound of the formula (I) or a salt thereof or a prodrug thereof.
Synthesis of substituted tetrahydronaphthalenes by manganese(III), cerium(IV), and iron(III) oxidation of substituted diethyl .alpha.-benzylmalonates in the presence of olefins
The oxidation of substituted diethyl alpha-benzylmalonates (1a-m) by manganese(III) acetate in acetic acid, cerium(IV) ammonium nitrate in methanol, or iron(III) perchlorate in acetonitrile in the presence of substituted olefins 2a-u was investigated. The results are consistent with a common mechanism. It involves selective generation of malonyl radicals from high-valent metal malonyl complexes, their addition to the olefin, and competition of the adduct radical between intramolecular cyclization to produce highly functionalized tetrahydronaphthalenes (3) and oxidation by metal salt to give mainly gamma-lactones (5). Several electron-withdrawing and releasing substituents on the aromatic ring and on the olefin can be successfully used in the synthesis of 3 without olefin telomerization. The influence of metal and olefin or aromatic substituents on the homolytic addition and intramolecular aromatic substitution is discussed.