An effective approach to the enantiomers of alicyclic β-aminonitriles by using lipase catalysis
摘要:
Lipase-catalyzed N-acylations of racemic cis- and trans-2-aminocyclopentane- (and cyclohexane-) carbonitriles with 2,2,2-trifluoethyl butanoate in tert-butyl methyl ether (TBME) and in room-temperature ionic liquids (RTILs) were studied. The racemates were effectively resolved (E > 200) on a preparative scale by lipase PS-C II (lipase from Burkholderia cepacia) in TBME, resulting in two enantiomers in their enantiopure forms at 50% conversion. The reactions in RTILs with Novozym 435 (Candida antarctica lipase B) were slow and proceeded with low enantio selectivity. (c) 2005 Elsevier Ltd. All rights reserved.
An effective approach to the enantiomers of alicyclic β-aminonitriles by using lipase catalysis
摘要:
Lipase-catalyzed N-acylations of racemic cis- and trans-2-aminocyclopentane- (and cyclohexane-) carbonitriles with 2,2,2-trifluoethyl butanoate in tert-butyl methyl ether (TBME) and in room-temperature ionic liquids (RTILs) were studied. The racemates were effectively resolved (E > 200) on a preparative scale by lipase PS-C II (lipase from Burkholderia cepacia) in TBME, resulting in two enantiomers in their enantiopure forms at 50% conversion. The reactions in RTILs with Novozym 435 (Candida antarctica lipase B) were slow and proceeded with low enantio selectivity. (c) 2005 Elsevier Ltd. All rights reserved.