Penicillin acylase-catalyzed peptide synthesis: a chemo-enzymatic route to stereoisomers of 3,6-diphenylpiperazine-2,5-dione
摘要:
Chiral dipeptides of phenylglycine were synthesized using immobilized Escherichia coli penicillin acylase. The high selectivity of penicillin acylase for L-amino acids as the nucleophile resulted in the efficient acylation of L-phenylglycine by D-phenylglycine amide at pH 9.7 to give D-phenylglycyl-L-phenylglycine in 69% yield. No isomers or tripeptides were formed. The low enantiospecificity of the enzyme for the acyl donor provided the possibility of preparing the corresponding L,L-dipeptides, starting from L-phenylglycine methyl ester as both donor and acceptor at pH 7.5, resulting in a 63% yield of L-phenylglycyl-Lphenylglycine methyl ester. The product precipitated under the reaction conditions; this effectively prevented the formation of oligomers as well as chemical transformation of the product.The dipeptide esters of phenylglycine easily cyclized to diketopiperazines in aqueous methanol. L-Pheny-glycyl-L-phenylglycine methyl ester formed L,L-3,6-diphenylpiperazine-2,5-dione (cis); the achiral trans isomer was obtained from D-phenylglycyl-L-phenylglycine methyl ester. (C) 2000 Elsevier Science Ltd. All rights reserved.
Penicillin acylase-catalyzed peptide synthesis: a chemo-enzymatic route to stereoisomers of 3,6-diphenylpiperazine-2,5-dione
摘要:
Chiral dipeptides of phenylglycine were synthesized using immobilized Escherichia coli penicillin acylase. The high selectivity of penicillin acylase for L-amino acids as the nucleophile resulted in the efficient acylation of L-phenylglycine by D-phenylglycine amide at pH 9.7 to give D-phenylglycyl-L-phenylglycine in 69% yield. No isomers or tripeptides were formed. The low enantiospecificity of the enzyme for the acyl donor provided the possibility of preparing the corresponding L,L-dipeptides, starting from L-phenylglycine methyl ester as both donor and acceptor at pH 7.5, resulting in a 63% yield of L-phenylglycyl-Lphenylglycine methyl ester. The product precipitated under the reaction conditions; this effectively prevented the formation of oligomers as well as chemical transformation of the product.The dipeptide esters of phenylglycine easily cyclized to diketopiperazines in aqueous methanol. L-Pheny-glycyl-L-phenylglycine methyl ester formed L,L-3,6-diphenylpiperazine-2,5-dione (cis); the achiral trans isomer was obtained from D-phenylglycyl-L-phenylglycine methyl ester. (C) 2000 Elsevier Science Ltd. All rights reserved.
Penicillin acylase-catalyzed peptide synthesis: a chemo-enzymatic route to stereoisomers of 3,6-diphenylpiperazine-2,5-dione
作者:Luuk M van Langen、Fred van Rantwijk、Vytas K Švedas、Roger A Sheldon
DOI:10.1016/s0957-4166(00)00027-6
日期:2000.3
Chiral dipeptides of phenylglycine were synthesized using immobilized Escherichia coli penicillin acylase. The high selectivity of penicillin acylase for L-amino acids as the nucleophile resulted in the efficient acylation of L-phenylglycine by D-phenylglycine amide at pH 9.7 to give D-phenylglycyl-L-phenylglycine in 69% yield. No isomers or tripeptides were formed. The low enantiospecificity of the enzyme for the acyl donor provided the possibility of preparing the corresponding L,L-dipeptides, starting from L-phenylglycine methyl ester as both donor and acceptor at pH 7.5, resulting in a 63% yield of L-phenylglycyl-Lphenylglycine methyl ester. The product precipitated under the reaction conditions; this effectively prevented the formation of oligomers as well as chemical transformation of the product.The dipeptide esters of phenylglycine easily cyclized to diketopiperazines in aqueous methanol. L-Pheny-glycyl-L-phenylglycine methyl ester formed L,L-3,6-diphenylpiperazine-2,5-dione (cis); the achiral trans isomer was obtained from D-phenylglycyl-L-phenylglycine methyl ester. (C) 2000 Elsevier Science Ltd. All rights reserved.