The first example of Cu(ii)-mediated oxidative coupling of aromatic carboxylic acids with the C(sp3)–H bond adjacent to the keto group ofN,N-dialkylamides has been developed.
Use of “Homeopathic” Ligand-Free Palladium as Catalyst for Aryl-Aryl Coupling Reactions
作者:Asaf Alimardanov、Lizette Schmieder-van de Vondervoort、André H. M. de Vries、Johannes G. de Vries
DOI:10.1002/adsc.200404210
日期:2004.12
We have previously shown that the use of ligand-free palladium employing Pd(OAc)2 as catalystprecursor in the Heck reaction of aryl bromides is possible if low catalyst loadings, typically between 0.01–0.1 mol % are used. We have now tested this phenomenon, which we have dubbed “homeopathic” palladium, in biaryl formation using the Suzuki, the Negishi and the Kumada cross-coupling reactions. The Suzuki
decarbonylative alkenylation of aromatic carboxylic acids was developed. Under the reaction conditions, various benzoic acids including those bearing functional groups coupled to terminal alkenes, producing the corresponding internal alkenes in good to high yields. Cinnamic acids and bioactive benzoic acids such as 3-methylflavone-8-carboxylic acid, probenecid, adapalin, and febuxostat were also applicable to this
Visible-light-promoted oxidation/condensation of benzyl alcohols with dialkylacetamides to cinnamides
作者:Tianlong Yang、Maojian Lu、Zhaowei Lin、Mingqiang Huang、Shunyou Cai
DOI:10.1039/c8ob02938e
日期:——
Oxidative cross-coupling reactions of benzylalcohols with N,N-dialkylacetamides were developed only employing oxygen as the terminal oxidant, efficiently providing a new, novel protocol for the construction of multifunctionalized cinnamides with the synergistic effects of KOH, organic photocatalyst eosin Y, and visible light irradiation at room temperature. A broad substrate scope and mild reaction
The invention relates to compounds of formula
wherein the substituents are as described in claim
1
. Compounds of formula I are modulators for amyloid beta and thus, they may be useful for the treatment or prevention of a disease associated with the deposition of β-amyloid in the brain, in particular Alzheimer's disease, and other diseases such as cerebral amyloid angiopathy, hereditary cerebral hemorrhage with amyloidosis, Dutch-type (HCHWA-D), multi-infarct dementia, dementia pugilistica and Down syndrome.