Practical synthesis of L-erythro- and L-threo-4-fluoroglutamic acids using aminoacylase
摘要:
Enantiomerically pure L-erythro- and L-threo-4-fluoroglutamic acids 1a and 1b were conveniently prepared. The key steps in this synthesis relied upon separation of diastereomers of N-chloroacetyl-4-fluoroglutamic acid 5-methyl ester 7 by recrystallization and enzymatic resolution of enantiomers of the resulting 7(a+c) and 7(b+d) by aminoacylase. Protection of the gamma-carboxyl group as a methyl ester was found to be crucial for this enzymatic reaction. Copyright (C) 1996 Elsevier Science Ltd.
Practical synthesis of L-erythro- and L-threo-4-fluoroglutamic acids using aminoacylase
摘要:
Enantiomerically pure L-erythro- and L-threo-4-fluoroglutamic acids 1a and 1b were conveniently prepared. The key steps in this synthesis relied upon separation of diastereomers of N-chloroacetyl-4-fluoroglutamic acid 5-methyl ester 7 by recrystallization and enzymatic resolution of enantiomers of the resulting 7(a+c) and 7(b+d) by aminoacylase. Protection of the gamma-carboxyl group as a methyl ester was found to be crucial for this enzymatic reaction. Copyright (C) 1996 Elsevier Science Ltd.