Solvent-free kinetic resolution of primary amines catalyzed by Candida antarctica lipase B: effect of immobilization and recycling stability
作者:Mari Päiviö、Päivi Perkiö、Liisa T. Kanerva
DOI:10.1016/j.tetasy.2012.02.008
日期:2012.2
Highly enantioselective (E >200) N-acylation of nine racemic primary amines with isopropyl methoxyacetate in the presence of CandidaantarcticalipaseB (Novozym 435) has been reported to yield the unreacted (S)-amines (ee ⩾98%) and produced the (R)-amides (ee ⩾95%) at 50% conversion under solvent-free conditions. One of the amines and the acyl donor have been used in an equimolar ratio at room temperature
Dynamic Kinetic Resolution of Primary Amines with a Recyclable Pd Nanocatalyst for Racemization
作者:Mahn-Joo Kim、Won-Hee Kim、Kiwon Han、Yoon Kyung Choi、Jaiwook Park
DOI:10.1021/ol070130d
日期:2007.3.1
A practical procedure for the dynamic kinetic resolution (DKR) of primary amines has been developed. This procedure employs a palladium nanocatalyst as the racemization catalyst, a commercial lipase (Novozym-435) as the resolution catalyst, and ethyl acetate or ethyl methoxyacetate as the acyldonor. Eleven primary amines and one amino acid amide have been efficiently resolved with good yields (85-99%)
Optically Active Amines by Enzyme-Catalyzed Kinetic Resolution
作者:Klaus Ditrich
DOI:10.1055/s-2008-1078451
日期:2008.7
Chiral amines are resolved by an enzyme-catalyzed kineticresolution. Key steps are the selective acylation of one enantiomer with isopropyl methoxyacetate, separation of the resulting amide from the unreacted antipode, and finally amide hydrolysis. The process proceeds with excellent selectivity and is highly flexible with regard to substrates.
Chemoenzymatic Dynamic Kinetic Resolution of Primary Amines Using a Recyclable Palladium Nanoparticle Catalyst Together with Lipases
作者:Karl P. J. Gustafson、Richard Lihammar、Oscar Verho、Karin Engström、Jan-E. Bäckvall
DOI:10.1021/jo500508p
日期:2014.5.2
amines to DKR reactions using two commercially available lipases, Novozyme-435 (Candida antartica Lipase B) and Amano Lipase PS-C1 (lipase from Burkholderia cepacia) as biocatalysts. The latter enzyme has not previously been used in the DKR of amines because of its low stability at temperatures over 60 °C. The viability of the heterogeneous Pd-AmP-MCF was further demonstrated in a recycling study,
Asymmetric Reductive Acylation of Aromatic Ketoximes by Enzyme-Metal Cocatalysis
作者:Kiwon Han、Jaiwook Park、Mahn-Joo Kim
DOI:10.1021/jo800270n
日期:2008.6.1
We have developed an efficient procedure for the asymmetric synthesis of chiral amides from ketoximes. This one-pot procedure employs two different types of catalysts, Pd nanocatalyst and lipase, for three consecutive transformations including hydrogenation, racemization, and acylation. Eight ketoximes have been efficiently transformed to the corresponding amides in good yields (83-92%) and high enantiomeric excesses (93-98%).