Efficient production of S-(+)-2-chlorophenylglycine by immobilized penicillin G acylase in a recirculating packed bed reactor was written by Xue, Ya-Ping;Jiang, Tao;Liu, Xue;Zheng, Yu-Guo. And the article was included in Biochemical Engineering Journal in 2013.Reference of 141109-14-0 The following contents are mentioned in the article:
(S)-(+)-2-Chlorophenylglycine 1 is an important intermediate in the synthesis of Clopidogrel. A recirculating packed bed reactor (RPBR) was constructed for efficient production of (S)-1 by kinetic resolution of racemic N-phenylacetyl-2- chlorophenylglycine 2 using immobilized penicillin G acylase (PGA). The immobilized PGA exhibited maximum activity at 50 °C and pH 8.0 with (R,S)-2 as substrate. The kinetic constants (Km and vmax) of immobilized PGA were calculated to be 20.61 mM and 83.2 mM/min/g, resp. The substrate displayed inhibitory effect on immobilized PGA with inhibition constant of 221.23 mM. The immobilized PGA showed a strict enantiospecificity for substrate at different temperature, pH and substrate concentration examined The performance and productivity of RPBR were evaluated by several critical parameters, including immobilized PGA load, substrate feeding rate, height to diameter ratio and so on. The kinetic resolution process shows higher initial reaction rate and conversion by recycling 100 mL of substrate solution (80 mM) through RPBRs packed with 6.0 g immobilized PGA with a feeding rate of 1.5 mL/min while the H/D ratio was 4.0. The immobilized PGA-catalyzed kinetic resolution of (R,S)-2 was successfully operated in the RPBR for 60 batches, with an average productivity of 1.2 g/L/h for (S)-1 in high optical purity (>97% enantiomeric excess) in semi-continuous operation. The residual (R)-2 can be easily racemized and then used as substrate. This study involved multiple reactions and reactants, such as (S)-Methyl 2-amino-2-(2-chlorophenyl)acetate (cas: 141109-14-0Reference of 141109-14-0).
(S)-Methyl 2-amino-2-(2-chlorophenyl)acetate (cas: 141109-14-0) belongs to organic chlorides. Organic chlorides are compounds containing a carbon-chlorine bond, which are widely used in the oil field as a wax dissolver. Organochlorine compounds are lipophylic, meaning they are more soluble in fat than in water. This gives them a high tenancy to accumulate in the food chain (biomagnification).Reference of 141109-14-0
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics