Kinetic Resolution of Alcohols Using a 1,2-Dihydroimidazo[1,2-<i>a</i>]quinoline Enantioselective Acylation Catalyst
作者:Vladimir B. Birman、Hui Jiang
DOI:10.1021/ol051063v
日期:2005.8.1
[GRAPHICS]A new enantioselective acylation catalyst (CI-PIO), designed to provide enhanced T-stacking with benzylic and cinnamyl alcohol substrates, was found to give considerably increased reaction rates and selectivities compared with the first-generation catalyst CF3-PIP.
Kinetic Resolution of Secondary Alcohols Using Amidine-Based Catalysts
作者:Ximin Li、Hui Jiang、Eric W. Uffman、Lei Guo、Yuhua Zhang、Xing Yang、Vladimir B. Birman
DOI:10.1021/jo202220x
日期:2012.2.17
Kinetic resolution of racemic alcohols has been traditionally achieved via enzymatic enantioselective esterification and ester hydrolysis. However, there has long been considerable interest in devising nonenzymatic alternative methods for this transformation. Amidine-based catalysts (ABCs), a new class of enantioselective acyl transfer catalysts developed in our group, have demonstrated, inter alia, high efficacy in the kinetic resolution of benzylic, allylic, and propargylic secondary alcohols and 2-substituted cycloalkanols, and thus provide a viable alternative to enzymes.
Chemoenzymatic Synthesis of Enantiomeric, Bicyclic δ-Halo-γ-lactones with a Cyclohexane Ring, Their Biological Activity and Interaction with Biological Membranes
Starting from 1-acetyl-1-cyclohexene, three enantiomeric pairs (ee ≥99%) of bicyclic δ-halo-γ-lactones with cyclohexane ring were obtained in five-step synthesis. The key stereochemical steps were lipase-catalyzed kinetic resolution of racemic 1-(cyclohex-1-en-1-yl) ethanol followed by transfer of chirality to ethyl 2-(2-ethylidenecyclohexyl) acetate in the Johnson-Claisen rearrangement. Synthesized