98442-10-5Relevant academic research and scientific papers
Rhodium-catalyzed isomerization of 1,3-diene monoepoxides to α,β-unsaturated carbonyl compounds
Sato, Susumu,Matsuda, Isamu,Izumi, Yusuke
, p. 255 - 266 (2007/10/02)
α,β-Unsaturated aldehydes and ketones are readily formed by the rhodium(I) catalyzed isomerization of 1,3-diene monoepoxides.When RhH(PPh3)4 is used as a catalyst, only (E)-α,β-unsaturated carbonyl compounds are obtained selectively.The initial 1,3-diene monoepoxides are prepared regiospecifically from α-trimethylsilyl ketones by a two step procedure, bromination and subsequent vinylative epoxidation of resulting α-bromo ketones.The overall transformation from α-trimethylsilyl ketones to α,β-enones is formally regarded as an equivalent of the regiospecific aldol condensation, and also enables the use of unsymmetrically substituted ketones as an enolate source.The significance of the isomerization as a key step in the synthesis of ar-turmerone is described.
A REGIO- AND STEREO-CONTROLLED SYNTHESIS OF α,β-UNSATURATED CARBONYL COMPOUNDS
Sato, Susumu,Matsuda, Isamu,Izumi, Yusuke
, p. 1527 - 1530 (2007/10/02)
α,β-Unsaturated carbonyl compounds and butenolides are readily prepared by the rhodium(I) catalyzed isomerization of 1,3-diene monoepoxides and α-alkylidene-γ-butyrolactones, respectively.The former transformation is formally regarded as the equivalent of a regiospecific aldol condensation of an unsymmetrical ketone.
