with a lipase produced the regio- and enantioconvergent transformation of racemic allyl alcohols (1 or 2) into optically active allyl esters. In this system, the vanadium compounds catalyzed the continuous racemization of the alcohols along with the transposition of the hydroxyl group, while the lipase effected the chemo- and enantioselective esterification to achieve the dynamickineticresolution.
complexes as a catalyst in dehydrative reactions with allylic alcohols. There is often an improvement in yield and, in particular, indium(III) chloride outperforms gold(I) as a catalyst in chemoselective reactions. For example, substrates with pendent alkyne or alkene groups react poorly under gold(I) catalysis, but are better tolerated under indium(III) chloride catalysis.
A method for the selective synthesis of alpha-chlorocarbonyls from allylic alcohols is presented. The reaction occurs through an acid- and iridium-catalyzed tandem process that combines a 1,3-transposition, a 3,1-hydrogen shift, and a chlorination process, and can be applied to a wide range of alpha-aromatic and heteroaromatic secondary allylic alcohols. Saturated non-chlorinated ketones or other side-products derived from overchlorination were not detected.