Synthesis of 1,4-keto esters and 1,4-diketones via palladium-catalyzed acylation of siloxycyclopropanes. Synthetic and mechanistic studies
作者:Tsutomu Fujimura、Satoshi Aoki、Eiichi Nakamura
DOI:10.1021/jo00008a043
日期:1991.4
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.
DERIVES DE THIOPHENES UTILES DANS LE TRAITEMENT DU DIABETE
申请人:Metabrain Research
公开号:EP2875010B1
公开(公告)日:2016-08-31
US9777015B2
申请人:——
公开号:US9777015B2
公开(公告)日:2017-10-03
USEFUL THIOPHENE DERIVATIVES IN THE TREATMENT OF DIABETES
申请人:METABRAIN RESEARCH
公开号:US20150197530A1
公开(公告)日:2015-07-16
The present invention relates to a thiophene derivative of the following general formula I
or an enantiomer, diastereoisomer, hydrate, solvate, tautomer, racemic mixture or pharmaceutically acceptable salt thereof or to its use as a drug in particular intended for treating and/or preventing diabetes, its complications and/or associated pathologies, advantageously diabetes of type II and hyperglycemia.