CATALYTIC SULFOXIDE-PROMOTED C-H OXIDATION, AND REGIOSELECTIVE PREPARATION OF ALLYLIC CARBOXYLATES

摘要

One aspect of the present invention relates to a method of preparing allylic carboxylate compounds comprising the step of contacting a compound comprising an allylic hydrogen atom with a carboxylic acid in the presence of palladium, a sulfoxide compound, and an oxidant. For example, the instant invention provides a catalytic method for the direct C-H oxidation of monosubstituted olefins to prepare linear (E)-allylic acetates in high regio- and stereoselectivities. In addition, the method of the instant invention can be used to prepare branched allylic carboxylates with high yield and regioselectivity. Another aspect of the present invention relates to sulfoxide compounds that are useful as catalysts to effect C-H oxidation. Remarkably, the allylic oxidation method of the invention is compatible with a wide range of functionality, such as amides, carbamates, carbonates, esters, and ethers.