Using a Temporary Silicon Connection in Stereoselective Allylation with Allylsilanes: Application to the Synthesis of Stereodefined 1,2,4-Triols
作者:Julien Beignet、Liam R. Cox
DOI:10.1021/ol035762o
日期:2003.10.1
[reaction: see text]. Treatment of aldehyde 6 with TMSOTf, in the presence of a Bronsted acid scavenger, effects an intramolecular allylation to provide the oxasilacycle 7 as the major diastereoisomer. Tamao oxidation of the C-Si bond in 7 affords the corresponding 1,2,4-triol 9.
Temporary Silicon Connection Strategies in Intramolecular Allylation of Aldehydes with Allylsilanes
作者:Julien Beignet、Peter J. Jervis、Liam R. Cox
DOI:10.1021/jo800824x
日期:2008.7.1
dimethylsilyl ether connection between the aldehyde and allylsilane, with a range of Lewis and Brønsted acid activators provides an (E)-diene product. The mechanism of formation of this undesired product is discussed. Systems containing a sterically more bulky diethylsilyl ether connection react differently: thus in the presence of TMSOTf and a Brønsted acid scavenger, intramolecular allylation proceeds