New one carbon homologation reagents utilizing electrochemical oxidation of organosilicon compounds
摘要:
Phenylthio(trimethylsilyl)methane, phenylthiosbis(trimethylsily)methane, methoxy(trimethysily)methane, and methoxybis(trimethylsilyl)methane are depronated and the resulting anions are alkylated with electrophiles such as organic halides. The alkylation products are readily converted into the corresponding dimethyl acetals or methyl esters by electrochemical oxidation in methanol.
The alpha-hydroxylation of ketones and aldehydes to alpha-hydroxyketals mediated by iodine under basic conditions in MeOH is described. Enolates generated under the reaction conditions are iodinated and the resulting alpha-iodocarbonyl is transformed into the hydroxyketal. The use of iodine for this chemistry represents an economical and practical alternative to existing methods for this transformation. (C) 2004 Elsevier Ltd. All rights reserved.
New one carbon homologation reagents utilizing electrochemical oxidation of organosilicon compounds
Phenylthio(trimethylsilyl)methane, phenylthiosbis(trimethylsily)methane, methoxy(trimethysily)methane, and methoxybis(trimethylsilyl)methane are depronated and the resulting anions are alkylated with electrophiles such as organic halides. The alkylation products are readily converted into the corresponding dimethyl acetals or methyl esters by electrochemical oxidation in methanol.
Methoxy(trimethylsilyl)methane and methoxybis(trimethylsilyl)methane as new reagents for homologation
New synthons of formylanion (methoxy(trimethylsilyl)methane (1)) and alkoxylcarbonyl anion (methoxybis(trimethylsilyl)methane (2)) have been developed using oxidative cleavage of the carbon-silicon bond by anodic oxidation.