alpha,alpha-Bis(phenylseleno)ketones have been synthesized by phenylselenenylation of enolates derived from alpha-phenylseleno ketones. Depending on the structure of the ketones, three experimental procedures were adopted.
Tandem Pd/Au-Catalyzed Route to α-Sulfenylated Carbonyl Compounds from Terminal Propargylic Alcohols and Thiols
作者:Srijit Biswas、Rahul A. Watile、Joseph S. M. Samec
DOI:10.1002/chem.201304111
日期:2014.2.17
highly atom‐economical tandem Pd/Au‐catalyzed route to α‐sulfenylated carbonylcompounds from terminal propargylic alcohols and thiols has been developed. This one‐step procedure has a wide substrate scope with respect to substituents at the α‐position of the alcohol. Both aromatic and aliphatic thiols generated the α‐sulfenylated carbonyl products in good to excellent yields. A mechanism is proposed in
experimental conditions for the preparation of trimethylsilyl enolethers 3 from α-phenylseleno aldehydes 1, compatible with a limited deselenenylation of the substrate, were studied. Starling from α-phenylseleno ketones 2, the enoxysilanes 4, bearing a vinylic PhSe group, are the major products when triethylamine is the base. Trimethylsilyl enolethers 5 with an allylic PhSe group arc also formed beside 4
alpha-Phenylselanyl gamma-unsaturated ketones were obtained through allylation of enolates generated by potassium t-butoxide cleavage of beta-phenylselanyl silyl enol ethers derived from alpha-phenylselanyl ketones. With enoxysilanes prepared from alpha-phenylselanyl aldehydes, O-allylation and O-benzylation of the corresponding enolates were also observed. (C) 1997 Elsevier Science Ltd.
DETTI M. R.; WOOD G. P., J. ORG. CHEM., 1980, 45, NO 1, 80-89