Highly cis- or trans-selective oxygen to carbon rearrangements of anomerically linked 6-substituted tetrahydropyranyl enol ethers
作者:Darren J. Dixon、Steven V. Ley、Edward W. Tate
DOI:10.1039/a904891j
日期:——
Low temperature Lewis acid catalysed oxygen to carbon rearrangements of anomerically linked 6-substituted tetrahydropyranyl enol ethers lead to the corresponding trans-ketones in a highly diastereoselective manner, whereas at higher temperatures the cis-ketones are formed with a high degree of selectivity under thermodynamic control.
Use of Acid Fluorides Increases the Scope of the Reductive Acylation of Esters
作者:Yongda Zhang、Tomislav Rovis
DOI:10.1021/ol049333h
日期:2004.5.1
The use of acyl fluorides in the Rychnovsky reductive acylation of esters allows a variety of esters to be converted to their corresponding alpha-acyloxy ethers in good to excellent yields, without the need to sacrifice an extra equiv of carboxylic acid functionality.
Diastereoselective oxygen to carbon rearrangements of anomerically linked enol ethers and the total synthesis of (+)-(S,S )-(cis-6-methyltetrahydropyran-2-yl)acetic acid, a component of civet
作者:Darren J. Dixon、Steven V. Ley、Edward W. Tate
DOI:10.1039/b001243m
日期:——
range of enol ethers, linked via their oxygen atom to the anomeric centre of a pyran ring system, was shown to undergo oxygen to carbon rearrangement upon treatment with a Lewisacid to give the corresponding 2-carbon substituted products. At low temperature, trimethylsilyl trifluoromethanesulfonate catalysed rearrangements of anomerically linked 6-substituted tetrahydropyranyl enol ethers gave selectively