Carbonium ion rearrangements controlled by the presence of a silyl group
作者:Ian Fleming、Shailesh K Patel
DOI:10.1016/s0040-4039(01)92922-3
日期:——
Tertiary alcohols with a λ-silyl group (3) generally undergo a simple carboniumionrearrangement in acid giving a single alkene product (4) with loss of the silyl group.
geminal divinyl compounds from ketones was developed. An allyl titanium reagent prepared from 1-phenylthio-4-trimethylsilyl-2-butene was reacted with a ketone, and the resulting tertiary alcohol was subjected to a Brønsted acid-mediated rearrangement reaction to generate a geminal divinyl compound. Introduction of another alkene moiety followed by ring closing metathesis resulted in a bicyclic compound
Synthesis of cyclopentanone derivatives with polystyrene-supported cyclopentadienyl rhodium catalysts
作者:Dirk P. Dygutsch、Peter Eilbracht
DOI:10.1016/0040-4020(96)00181-0
日期:1996.4
An efficient and reusable polystyrene-supported η5-cyclopentadienyl rhodium catalyst is prepared and applied to the synthesis of substituted cyclopentanones either via hydrocarbonylative cyclization starting from 1,4-dienes or from allyl vinyl ethersviatandem Claisen rearrangement and intramolecular hydroacylation of the 4-pentenal intermediates.