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.
Migratory Dynamic Kinetic Resolution of Carbocyclic Allylic Alcohols
作者:Chicco Manzuna Sapu、Tamás Görbe、Richard Lihammar、Jan-E. Bäckvall、Jan Deska
DOI:10.1021/ol502979g
日期:2014.11.21
isomerization/racemization catalyst gives rise to carbocyclic allylic esters with excellent stereoselectivity from readily available tertiary carbinols. An easy-to-use teabag setup combining resin-bound catalysts, a biphasic isooctane–water solvent system, and a highly lipophilic acyl donor efficiently suppresses side reactions and allows for the preparation of functionalized carbocyclic building blocks in high yields
V for resolution: A new oxovanadium catalyst (V‐MPS; see scheme) immobilized in the pores of mesoporous silica has been developed. The combined use of V‐MPS and lipases achieved the dynamickineticresolution of a wide range of racemic alcohols (1 or 2) to produce optically active esters 3 in high chemical and optical yields. The paired catalysts retained high catalytic activity when reused up to six
Enzyme- and Ruthenium-Catalyzed Dynamic Kinetic Resolution of Functionalized Cyclic Allylic Alcohols
作者:Richard Lihammar、Renaud Millet、Jan-E. Bäckvall
DOI:10.1021/jo402086z
日期:2013.12.6
Enantioselective synthesis of functionalized cyclic allylic alcohols viadynamic kinetic resolution has been developed. Cyclopentadienylruthenium catalysts were used for the racemization, and lipase PS-IM or CALB was employed for the resolution. By optimization of the reaction conditions the formation of the enone byproduct was minimized, making it possible to prepare a range of optically active functionalized