Efficient enzymatic kinetic resolution of 2-heptylamine with a highly active acyl donor
摘要:
Novozyme435 facilitated kinetic resolution of 2-heptylamine was here presented. Methyl methoxyacetate was used as acyl donor. A survey of influencing factors including hydrogen bonding effect, solvent effect, steric effect, temperature and the amount of acyl donor were investigated in detail. At the optimum conditions, the enantiomeric separation was successfully obtained within 8 h at 20 degrees C. and gave high conversion and optical purity of (R)-2-heptylamine, 48.9% and over 99% respectively. The immobilized lipase B was found to be suitable for the enantiomeric separation of aliphatic amines with good recyclability. (C) 2010 Elsevier B.V. All rights reserved.
DOI:
10.1016/j.catcom.2010.04.015
作为产物:
描述:
甲氧基乙酸乙酯 、 异庚胺 在
3% Pd nanoparticles supported on the external surface of the ethylenediamine functionalized MIL-101 、 cross-linked enzyme aggregates of Candida antarctica lipase B 作用下,
以
甲苯 为溶剂,
70.0 ℃
、5.0 kPa
条件下,
反应 5.0h,
以>99% ee的产率得到
Fully Enzymatic Resolution of Chiral Amines: Acylation and Deacylation in the Presence of<i>Candida antarctica</i>Lipase B
作者:Hilda Ismail、Rute Madeira Lau、Fred van Rantwijk、Roger A. Sheldon
DOI:10.1002/adsc.200800091
日期:2008.7.7
(CaLB)-catalyzed acylation with N-methyl- and N-phenylglycine, as well as analogues having the general formula R1XCH2CO2R2 (R1=Me, Ph; X=O, S) afforded the corresponding enantioenriched amides, which were subsequently enzymatically hydrolyzed. Surprisingly, CaLB also proved to be the catalyst of choice for this latter step. The heteroatom in the acyl donor profoundly influences both the enzymatic acylation and
已经证明了用于拆分手性胺的完全酶促方法。南极假丝酵母脂肪酶B(CaLB)催化的N-甲基和N-苯基甘氨酸酰化反应以及具有通式R 1 X CH 2 CO 2 R 2(R 1的类似物=我,Ph;X = O,S)得到相应的对映体富集的酰胺,其随后被酶水解。出乎意料的是,CaLB也被证明是此后一步的选择催化剂。酰基供体中的杂原子深刻影响酶的酰化作用和脱酰作用。就合成和水解中的对映选择性以及反应速率而言,O-取代的试剂表现最佳。
Heterogeneous Raney Nickel and Cobalt Catalysts for Racemization and Dynamic Kinetic Resolution of Amines
作者:Andrei N. Parvulescu、Pierre A. Jacobs、Dirk E. De Vos
DOI:10.1002/adsc.200700336
日期:2008.1.4
Raney metals were studied as heterogeneous catalysts for racemization and dynamickineticresolution (DKR) of chiral amines, as an alternative to metals like palladium or ruthenium. Both Raney nickel and cobalt were able to selectively racemize various chiral amines with high selectivity. In the racemization of benzylic primary amines, the minor formation of side products, e.g., secondary amines, can
acetic acid esters modified with electron withdrawing 2-alkoxy-groups was investigated as acylating agent in kinetic resolution (KR) of racemic amines. A homologous series of the isopropyl esters of four 2-alkoxyacetic acids (2-methoxy-, 2-ethoxy-, 2-propoxy- and 2-butoxyacetic acids) were prepared and investigated for enantiomer selective N-acylation, catalyzed by lipaseB from Candidaantarctica, under
Efficient enzymatic kinetic resolution of 2-heptylamine with a highly active acyl donor
作者:Jian-Hua Sun、Rong-Ji Dai、Wei-Wei Meng、Yu-lin Deng
DOI:10.1016/j.catcom.2010.04.015
日期:2010.6
Novozyme435 facilitated kinetic resolution of 2-heptylamine was here presented. Methyl methoxyacetate was used as acyl donor. A survey of influencing factors including hydrogen bonding effect, solvent effect, steric effect, temperature and the amount of acyl donor were investigated in detail. At the optimum conditions, the enantiomeric separation was successfully obtained within 8 h at 20 degrees C. and gave high conversion and optical purity of (R)-2-heptylamine, 48.9% and over 99% respectively. The immobilized lipase B was found to be suitable for the enantiomeric separation of aliphatic amines with good recyclability. (C) 2010 Elsevier B.V. All rights reserved.
Combining Pd nanoparticles on MOFs with cross-linked enzyme aggregates of lipase as powerful chemoenzymatic platform for one-pot dynamic kinetic resolution of amines
ethylenediamine-functionalized MIL-101 ([email protected]) with layered cross-linked enzyme aggregates of Candidaantarcticalipase B (CALB-CLEAs) was established for the first time. This combination served as an ultra-efficient chemoenzymatic catalyst system for one-pot dynamickineticresolution (DKR) of rac-1-phenylethylamine leading to optically pure product (>99% ee value) with almost full conversion