A PhI(OAc)2-promoted dioxygenation of allyl oximes, including one alkoxylation, has been developed. This reaction can give isoxazoline products bearing two contiguous tetrasubstituted carbons. Various oximes substrates bearing different aryl groups and tetrasubstituted-olefin moieties were compatible with the mild reaction conditions. A two-electron oxidation pathway was proposed based on results of
Low-valent magnesium(<scp>i</scp>)-catalyzed cyanosilylation of ketones
作者:Weifan Wang、Man Luo、Jia Li、Sumod A. Pullarkat、Mengtao Ma
DOI:10.1039/c8cc00826d
日期:——
The magnesium(I) complex [(XylNacnac)Mg]2 was employed as a highly efficient catalyst for the cyanosilylation of a variety of ketones with trimethylsilyl cyanide under mild conditions. In contrast to the traditional stoichiometric use of magnesium(I) complexes, 1 provides the first example of a truly catalytic application of Mg(I) complexes.
A highlyefficient cyanosilylation protocol mediated by the easily available n-BuLi with a wide range of aldehydes and ketones was developed. This protocol features excellent yields with very low n-BuLi loadings (0.01–0.05 mol%) at room temperature, solvent-free process, good chemo-/regio-selectivity and functional group tolerance and scalability. A possible reaction pathway based upon stoichiometric
A structurally characterized cationic aluminium complex [(AT)Al(DMAP)]+[OTf]- (3) stabilized through less bulky aminotroponate (AT) ligand is reported (DMAP = 4-(dimethylamino)pyridine). It works as an excellent mononuclear main-group catalyst (1 to 2 mol%) for the cyanosilylation of a variety of aldehydes and ketones by consuming just 5 to 30 min at room temperature.
available MgO and anion exchange resins. This catalyst also acts as a heterogeneous catalyst for the epoxidation of electron-deficient olefins with hydrogen peroxide. Further, the catalyst/product(s) separation can be easily carried out by the simple filtration (or centrifugation) and the reaction is immediately stopped by the removal of the solid catalyst, suggesting that the nature of the observed