Hydrazine hydrate induced reductive cleavage of α,β-epoxy ketones: an efficient procedure for the preparation of β-hydroxy ketones
作者:Jorge A.R. Salvador、Alcino J.L. Leitão、M. Luísa Sá e Melo、James R. Hanson
DOI:10.1016/j.tetlet.2004.12.103
日期:2005.2
An efficient and general procedure for the reductive cleavage of α,β-epoxyketones to the corresponding β-hydroxy ketones, using hydrazine hydrate in ethanol at low temperatures, is described.
Thiol/Diselenide Exchange for the Generation of Benzeneselenolate Ion. Catalytic Reductive Ring-Opening of .alpha.,.beta.-Epoxy Ketones
作者:Lars Engman、David Stern
DOI:10.1021/jo00097a019
日期:1994.9
In the presence of N-acetylcysteine sodium salt, benzeneselenolate ion was generated in situ from diphenyl diselenide via thiol/diselenide and thiol/selenenyl sulfide exchange in aqueous methanal under mild conditions. Benzeneselenolate ion thus formed was efficiently alkylated and arylated to afford alkyl phenyl selenides and aryl phenyl selenides, respectively. alpha,beta-Epoxy ketones were catalytically reduced by benzeneselenolate ion to afford beta-hydroxy ketones (aldols) in goad yields. The. stereospecificity of the reaction was demonstrated in the preparation of optically active beta-hydroxyketones from chiral alpha,beta-epoxy ketones.