The substratespectrum of the inverting alkylsulfatase Pisa1 was investigated using a range of sec‐alkyl sulfate esters bearing aromatic, olefinic and acetylenic moieties. Perfect enantioselectivities were obtained for substrates bearing groups of different size adjacent to the sulfate ester moiety. Insufficient selectivities could be doubled by using dimethyl sulfoxide (DMSO) as co‐solvent. Hydrolytically
One-Pot Deracemization of<i>sec</i>-Alcohols: Enantioconvergent Enzymatic Hydrolysis of Alkyl Sulfates Using Stereocomplementary Sulfatases
作者:Markus Schober、Michael Toesch、Tanja Knaus、Gernot A. Strohmeier、Bert van Loo、Michael Fuchs、Florian Hollfelder、Peter Macheroux、Kurt Faber
DOI:10.1002/anie.201209946
日期:2013.3.11
Hand in hand: The title transformation was achieved using a pair of sulfatases acting through inversion and retention of configuration on opposite substrate enantiomers. Using Pseudomonas aeruginosa arylsulfatase PAS with alkylsulfatase PISA1 in one‐pot leads to sec‐alcohols (80 to >99 % conversion) with 91 to greater than 99 % ee.
Reduction of .alpha.,.beta.-acetylenic ketones to (S)-propargyl alcohols of high enantiomeric purity
作者:M. Mark Midland、Aleksander Kazubski
DOI:10.1021/jo00135a036
日期:1982.7
Asymmetric reductions of propargyl ketones
作者:M. Mark midland、Alfonso tramontano、Aleksander kazubski、Richard S. graham、David J.S. tsai、Daniel B. cardin
DOI:10.1016/s0040-4020(01)82422-4
日期:1984.1
Propargyl ketones are readily reduced by the asymmetric reducing agent B-3-pinanyl-9- borabicyclo[3.3.1]-nonane (Alpine-borane). The reagent prepared from (+)-α-pinene and 9-BBN provides the R enantiomer while the S enantiomer can be obtained from (-)-α-pinene. Alternatively the S enantiomer can be prepared from the reagent derived from 9-BBN and the benzyl ether of nopol (6,6-dimethyl-bicyclo[3.11