72653-68-0

Upstream product

• 1126-80-3 (n-butylthio)benzene 
• 72653-47-5 α-chlorobutyl phenyl sulfide 
• 19980-34-8 trimethyl-(2-methyl-cyclopent-1-enyloxy)-silane 
• 1120-72-5 2-Methylcyclopentanone 

Relevant academic research and scientific papers

Thioalkylation of Enolates, II. α-Thioalkylation of Zinc Enolates to α,α-Disubstituted Ketones

An α-alkylation of the 2-methylcycloalkanones 1 and 4 at the higher substituted carbon can be achieved by thioalkylation of the corresponding zinc enolates with the α-chlorosulfides 3.The desulfurization can be carried out with either Raney nickel or lithium in diethylamine for compounds which contain double or triple bonds. Key Words: Zinc enolates, thioalkylation of / Ketones, α,α-disubstituted / Desulfurization

α-ALKYLATION AND α-ALKYLIDENATION OF CARBONYL COMPOUNDS BY O-SILYLATED ENOLATE PHENYLTHIOALKYLATION

For many reactions next to a carbonyl group, the use of O-silylated enolate chemistry offers improvements in yield and selectivity over the corresponding reactions of Group I metal enolates.In the case of α-alkylation of carbonyl compounds, Lewis acid (TiCl4 or ZnBr2) promoted phenylthioalkylation of O-silylated enolates 3 by α-chlorosulphides 4 (R3=H, Me, Prn, Pri, Bui, and Me3Si), followed by reductive sulphur removal by Raney nickel, 5->6, is found to be a reliable method for this synthetically important C-C bond forming step.An alternative sulphur elimination pathway via the sulphoxide, 5->7, allows the regio- and stereocontrolled α-alkylidenation of carbonyl compounds.The phenylthioalkylation reaction is applicable to ketones, aldehydes, esters, and lactones.

α-Alkylation and α-alkylidenation of carbonyl compounds: Lewis acid-promoted phenylthioalkylation of o-silylated enolates

The O-silylated enolates of ketones, aldehydes, esters, and lactones can be phenylthioalkylated in the presence of Lewis acids; reductive or oxidative sulphur-removal gives the regiospecifically α-alkylated or alkylidenated carbonyl compounds.