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DOI: 10.1055/s-0028-1087971
Efficient and Stereoselective Rearrangement of Baylis-Hillman Acetates Catalyzed by Gold(I) Chloride/Silver(I) Trifluoromethanesulfonate
Publication History
Publication Date:
24 February 2009 (online)

Abstract
Efficient and stereoselective rearrangement catalyzed by only one mole-percent gold(I) chloride/silver(I) trifluoromethanesulfonate of Baylis-Hillman acetates afforded 2-(acetoxymethyl)alk-2-enoates under mild reaction conditions in good to high yields with 100% E-selectivity. For cyclohex-2-enone-derived Baylis-Hillman acetates, the reaction gave 2-alkylidenecyclohex-3-enones in good yields.
Key words
gold/silver catalysis - stereoselectivity - rearrangements - Baylis-Hillman acetate - alk-2-enoates
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References
A referee commented that the loss of 1,3-diaxial repulsion between the methoxycarbonyl or R group and the acetal oxygens may be another factor why intermediate 7 is not destabilized so much (see Scheme [5] ).