Ir(III)-Catalyzed Carbocarbation of Alkynes through Undirected Double C–H Bond Activation of Anisoles
摘要:
A novel, electron-deficient cyclopentadienyl iridium(III) catalyst enables sequential cleavage of arene C(sp(2))-H and methoxy C(sp(3))-H bonds of anisoles, generating reactive metalacycles that insert difluoroalkynes to afford chromenes under mild reaction conditions. This transformation is an arylalkylation of an alkyne-a carbocarbation-via a nonchelate-assisted cleavage of two C-H bonds.
Synthesis of Cyclic Peroxides Containing the Si-<i>gem</i>-bisperoxide Fragment. 1,2,4,5,7,8-Hexaoxa-3-silonanes as a New Class of Peroxides
作者:Alexander O. Terent'ev、Maxim M. Platonov、Anna I. Tursina、Vladimir V. Chernyshev、Gennady I. Nikishin
DOI:10.1021/jo7027213
日期:2008.4.1
A method was developed for the synthesis of the previously unknown class of organic peroxides, 1,2,4,5,7,8-hexaoxa-3-silonanes, based on the reaction of dialkyldichlorosilanes with 1,1‘-dihydroperoxyperoxides. 1,2,4,5,7,8-Hexaoxa-3-silonanes are rather stable under ambient conditions and were characterized by NMR spectroscopy, X-ray diffraction, and elemental analysis. Their yields are in a range of
The acetolysis reactions of compounds of the type XSiMe2Cl (I) with acetic acid in the presence of acetic anhydride were studied kinetically by means of 1H NMR spectroscopy. We found these reactions exclusively influenced by steric effects (ϱ = 0)
通过1 H NMR光谱动力学研究了XSiMe 2 Cl(I)型化合物在乙酸酐存在下与乙酸的乙酰化反应。我们发现这些反应仅受空间位阻影响(ϱ = 0)
Acyloxysilanes are prepared by the anhydrous reaction of stoichiometric amounts of a carboxylic acid with a mixture of a halosilane and a silazane in an aprotic solvent, such as diethyl ether, acetonitrile, tetrahydrofuran or toluene, in an inert gas atmosphere. In a preferred embodiment the silazane is prepared in situ by the reaction of the corresponding halosilane and ammonia. No catalyst is necessary and the reaction preferably is performed at a temperature of -5.degree. C. to 45.degree. C.
[EN] DIMETHYLFUMARATE AND PRODRUGS FOR TREATMENT OF MULTIPLE SCLEROSIS<br/>[FR] DIMÉTHYLFUMARATE ET PROMÉDICAMENTS POUR LE TRAITEMENT DE LA SCLÉROSE EN PLAQUES
申请人:BIOGEN MA INC
公开号:WO2015172083A1
公开(公告)日:2015-11-12
Methods and systems to evaluate prodrugs, drugs, or drug metabolites are provided.