FACILE ROUTE TO 1-PHOSPHORYL- AND 1-SULFONYL-1,3-DIENES VIA PALLADIUM-CATALYZED ELIMINATION OF ALLYLIC ACETATES
The palladium(II)-catalyzed chloroacetoxylation of 1,3-dienes is employed to prepare 1-chloro-4-acetoxy-2-alkenes which are then transformed into 1-phosphoryl- or 1-sulfonyl-4-acetoxy-2-alkenes respectively.Elimination of acetate is promoted by palladium(
Akermark, Bjoern,Nystroem, Jan-E.,Rein, Tobias,Baeckvall, Jan-E.,Helquist, Paul,Aslanian, Robert
p. 5719 - 5722
(2007/10/02)
Process for producing a sulfone derivative of vitamin A alcohol
A process for the preparation of vitamin A and esters thereof from the condensation of a sulfone of 2-methyl-4-hydroxy-but-2-ene and an activated derivative of 3-methyl-5-(2,6,6-trimethyl-cyclohexen-1-yl)penta-2,4-diene including intermediates therein.
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(2008/06/13)
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