The Stereochemistry of Nucleophilic Addition. IV. The Condensation of 2,2,6-Trimethylcyclohexanone with<i>t</i>-Butyl Acetate in the Presence of Lithium Amide
The stereochemistry of the condensations of 2,2,6-trimethylcyclohexanone with t-butyl acetate in the presence of lithium amide, with ethyl bromoacetate in the presence of zinc (Reformatsky reaction), and with ethylmagnesium iodide (Grignard reaction) was studied. The configurations of the products in these reactions were assigned on the basis of their chromatographic behavior, and on the basis of spectroscopic
Stereoselective synthesis of (±)-ancistrofuran: stereoselective reduction of a γ-hydroxyketone
作者:Raymond Baker、Paul D. Ravenscroft、Christopher J. Swain
DOI:10.1039/c39840000074
日期:——
A remarkably stereoselectivereduction of a γ-hydroxyketone with two equiv. of lithium triethylborohydride has been observed and this effect has been suggested to originate from ‘chelation control’; the reaction has been utilised in a short stereoselectivesynthesis of ancistrofuran.