Ene cyclisations of α-(prenyl)dialkylsilyloxy aldehydes: formation and oxidative cleavage of oxasilacyclohexanols
作者:Jeremy Robertson、Michael J. Hall、Petra M. Stafford、Stuart P. Green
DOI:10.1039/b306922m
日期:——
A variety of routes are described for the synthesis of α-silyloxy aldehydes in which the silicon atom bears a prenyl side chain. These compounds are shown to undergo stereoselective carbonyl ene cyclisation under mildly Lewis acidic conditions and the derived silacycles are cleaved to afford single diastereomers of functionalised triols.
Rhodium(II)-Catalyzed Stereoselective Synthesis of Allylsilanes
作者:David M. Guptill、Carolyn M. Cohen、Huw M. L. Davies
DOI:10.1021/ol4028978
日期:2013.12.20
The rhodium-catalyzed decomposition of 2-(triisopropylsilyl)ethyl aryl- and vinyldiazoacetates results in the stereoselectiveformation of Z-allylsilanes. The transformation is considered to proceed by silyl-directed intramolecular C–H functionalization to form a β-lactone intermediate followed by a silyl-activated extrusion of carbon dioxide.
(Triisopropylsilyl)acetaldehyde acetal as a novel protective group for 1,2-diols
作者:Jun’ichi Uenishi、Yusuke Tanaka、Nobuyuki Kawai
DOI:10.1016/j.tetlet.2006.05.121
日期:2006.7
(Triisopropylsilyl)acetaldehyde dimethyl acetal (TIPS-ADMA) was synthesized from chlorotriisopropylsilane in three steps. Cyclic and acyclic 1,2-diols can be transformed to (triisopropylsilyl)ethylidene acetals (TIPS-AA). Removal of the acetal by LiBF4 regenerates the starting diol in excellent yield even in the presence of an acetonide of 1,2-diol. The TIPS-AA group can survive under the deprotection