Determination de la conformation des cations formes par ionisation des dimethyl-1,1 methano-3,4 tetrahydro-1,2,3,4naphtalene-2ols substitues en 2, a l'aide d'une methode basee une equation de difference de君士坦丁堡
The α-alkylation of ketones using an earth-abundant and nonprecious NiBr2/L1 system is reported. This nickel-catalyzed reaction could be performed in gram scale and successfully applied in the synthesis of donepezil (Alzheimer’s drug) and functionalization of steroid hormones and fatty acid derivatives. Synthesis of N-heterocycles, methylation of ketones, and one-pot double alkylation to bis-hetero
METHOD FOR PRODUCING ALPHA-ACYLOXYCARBONYL COMPOUND AND NOVEL ALPHA-ACYLOXYCARBONYL COMPOUND
申请人:Ishihara Kazuaki
公开号:US20120323014A1
公开(公告)日:2012-12-20
A method for producing an α-acyloxycarbonyl compound of the present invention includes performing an intermolecular reaction between a carboxylic acid and a carbonyl compound selected from the group consisting of ketones, aldehydes, and esters, which have a hydrogen atom at the α-position, using a hydroperoxide as an oxidizer and an iodide salt as a catalyst precursor, thereby introducing an acyloxy group derived from the carboxylic acid into the α-position of the carbonyl compound.
Catalytic Cross-Coupling of Alkylzinc Halides with α-Chloroketones
作者:Chrysa F. Malosh、Joseph M. Ready
DOI:10.1021/ja0467768
日期:2004.8.1
this method, primary and secondary alkyl groups are introduced adjacent to a ketone carbonyl under mild reaction conditions and in good yield. Cyclic, acyclic, aromatic, and aliphatic α-chloroketones are suitable substrates. Opticallyactive α-chloroketones are converted to opticallyactive products. The reaction was found to proceed stereospecifically with inversion of stereochemistry. The reaction
The asymmetric protonation of silylenolates derived from tetralone, benzosuberone, and cyclohexanone has been successfully achieved by using simple and original betaine catalysts derived from Cinchona alkaloids (quinine and quinidine series) to afford the desired α-substituted ketones in high yields and moderate enantioselectivities. The ease of implementation of this approach along with the easy
New methods and reagents in organic synthesis. 75. asymmetric synthesis of α-hydroxy ketones using chiral phase transfer catalysts
作者:Moriyasu Masui、Akira Ando、Takayuki Shioiri
DOI:10.1016/0040-4039(88)85224-9
日期:——
Optically active α-hydroxyketones are obtained by oxidation of achiral ketones with molecular oxygen in two phase system usingchiralphasetransfercatalysts.