Mono- and Di-substituted 5,6-Diphenyl-3-alkylaminopyridazines Active as ACAT Inhibitors
摘要:
A series of mono- or di-para-substituted 5,6-diphenyl-3-alkylaminopyridazines were synthesized and their inhibitory activity against acylCoA:cholesterol acyltransferase (ACAT) was tested on the enzyme prepared from rat liver microsomes. The compound which combines a chlorine atom on the 6-phenyl ring and a n-hexylamino chain showed a significant enhancement of activity with respect to the unsubstituted derivative. Attempts to correlate the activity of the compounds to their structural features, also through theoretical calculations, are reported.
Synthesis of 1,4-keto esters and 1,4-diketones via palladium-catalyzed acylation of siloxycyclopropanes. Synthetic and mechanistic studies
摘要:
The reaction of a variety of siloxycyclopropanes with acid chlorides in the presence of a catalytic amount of a palladium/phosphine complex gives 1,4-dicarbonyl compounds to good yield. 1-Alkoxy-1-(trialkylsiloxy)-cyclopropanes react with both aromatic and aliphatic acid chlorides in chloroform to give 1,4-keto esters. Synthesis of 1,4-diketones by the acylation of 1-alkyl- or 1-aryl-1-siloxycyclopropanes has been achieved by carrying out the reaction if HMPA under 10-20 atm of carbon monoxide. Kinetics studies and product analysis revealed the unique mechanism of this reaction, which involves rate-determining cleavage of the strained cyclopropane carbon-carbon bond with a coordinatively unsaturated acylpalladium chloride complex. Ab initio calculations of hydroxylated cyclopropane model compounds showed that the unique reactivities of the siloxycyclopropanes may be correlated with the molecular orbital properties of these compounds rather than their ground-state structural properties.