Rhodium-Catalyzed Acyl-Transfer Reaction between Benzyl Ketones and Thioesters: Synthesis of Unsymmetric Ketones by Ketone CO–C Bond Cleavage and Intermolecular Rearrangement
In the presence of catalytic amounts of RhH(CO)(PPh3)3 and 1,2-bis(diphenylphosphino)benzene (dppBz), acyl groups were transferred between benzyl ketones and thioesters/aryl esters. The rhodium complex catalyzed the cleavage of ketone CO–C bonds and intermolecular rearrangement giving unsymmetric ketones. The acyl-transfer reaction also occurred with 1-(p-chlorophenyl)-3-(p-cyanophenyl)propane-2-one
source, a KF-catalyzed strategy was employed for the direct thiomethylation of carboxylic acids with DMSO for the preparation of methyl thioesters. In this process, a wide range of methyl thioesters were obtained in moderate to excellent yields. This novel strategy features the first use of DMSO as a methylthiolating agent for the construction of methyl thioesters, transition metal-free conditions, inexpensive
Conversion of Carbon-Sulfur Linkages into Carbon–Silicon Ones<i>via</i>Reductive Silylation. Preparation of Silyl Enol Ethers of Acyltrimethylsilanes
作者:Isao Kuwajima、Akio Mori、Masahiro Kato
DOI:10.1246/bcsj.53.2634
日期:1980.9
Reductive cleavage of carbon–sulfur linkages of silyl enol ethers of thiocarboxylic S-esters can be induced by treatment with sodium or potassium–sodium alloy in the presence of chlorotrimethylsilane, and the corresponding silyl enol ethers of acyltrimethylsilanes can be prepared in high yields.
在三甲基氯硅烷存在下,用钠或钾钠合金处理可诱导硫代羧酸 S 酯硅基烯醇醚的碳硫键发生还原性裂解,并以高产率制备出相应的酰基三甲基硅烷硅基烯醇醚。