Abstract:
The present invention discloses a process which comprises selectively hydrolyzing one enantiomer of racemic mixtures of an N-substituted beta-amino acid alkyl ester or N-substituted 2-homopipecolic acid ester represented by the formula (I): wherein Ar, R 1 , R 2 , R 3 , R 4 and R 5 are the same as defined in the specification, in the presence of a hydrolase to form an optically active ((R) or (S))-N-substituted beta-amino acid or optically active ((R) or (S))-N-substituted 2-homopipecolic acid represented by the formula (II): and simultaneously to obtain an unreacted optically active ((S) or (R))-N-substituted beta-amino acid alkyl ester or unreacted optically active ((S) or (R))-N-substituted 2-homopipecolic acid ester represented by the formula (III): which has a reverse steric absolute configuration to that of the compound represented by the formula (II).
Abstract:
The present invention relates to a process for preparing an optically active (S or R)-.beta.-amino acid represented by the formula (II): (see formula II) wherein R represents an alkyl group, alkenyl group, alkynyl group, cycloalkyl group, aralkyl group, aryl group or heteroaryl group each of which may have a substituent(s), and * represents an asymmetric carbon atom, and an optically active (R or S)-.beta.-amino acid ester represented by the formula (III): (see formula III) wherein R has the same meaning as defined above, R1 represents an alkyl group which may have a substituent(s), and represents an asymmetric carbon atom, provided that it has a reverse absolute configuration to that of the compound of the formula (II), which comprises selectively hydrolyzingwater and one of enantiomers of a .beta.-amino acid ester represented by the formula (I): (see formula I ) wherein R and R1 have the same meanings aa defined above, which is a racemic mixture, in the presence of a hydrolase in an organic solvent.
Abstract:
Un procedimiento para preparar un (S o R)-ß-aminoácido ópticamente activo representado por la fórmula (II): en la que R representa un grupo alquilo que tiene de 1 a 10 átomos de carbono que puede estar sustituido con un átomo de halógeno, un grupo hidroxilo, un grupo alcoxilo que tiene de 1 a 4 átomos de carbono, un grupo amino, un grupo dialquilamino, un grupo ciano o un grupo nitro; un grupo alquenilo que tiene de 2 a 10 átomos de carbono que puede estar sustituido con un átomo de halógeno, un grupo hidroxilo, un grupo alcoxilo que tiene de 1 a 4 átomos de carbono, un grupo amino, un grupo dialquilamino, un grupo ciano o un grupo nitro; un grupo alquinilo que tiene de 2 a 10 átomos de carbono que puede estar sustituido con un átomo de halógeno, un grupo hidroxilo, un grupo alcoxilo que tiene de 1 a 4 átomos de carbono, un grupo amino, un grupo dialquilamino, un grupo ciano o un grupo nitro; un grupo cicloalquilo que tiene de 3 a 10 átomos de carbono que puede estar sustituido con un grupo alquilo que tiene de 1 a 6 átomos de carbono, un átomo de halógeno, un grupo hidroxilo, un grupo alcoxilo que tiene de 1 a 4 átomos de carbono, un grupo amino, un grupo dialquilamino, un grupo ciano o un grupo nitro; un grupo arilalquilo que puede estar sustituido con un grupo alquilo que tiene de 1 a 10 átomos de carbono, un grupo nitro, un grupo hidroxilo, un átomo de halógeno, un grupo alcoxilo que tiene de 1 a 10 átomos de carbono, un grupo arilalquiloxilo que tiene de 7 a 10 átomos de carbono, un grupo ariloxilo, un grupo alcoxialcoxilo, un grupo monoalquilamino, un grupo dialquilamino, un grupo acilamino, un grupo ciano o un grupo alquilo halogenado; un grupo arilo que puede estar sustituido con un grupo alquilo que tiene de 1 a 4 átomos de carbono, un grupo hidroxilo, un átomo de halógeno, un grupo alcoxilo que tiene de 2 a 4 átomos de carbono, un grupo alquilendioxi, un grupo nitro, un grupo ciano o un grupo alquilo halogenado; o un grupo heteroarilo que puede estar sustituido con un grupo alquilo que tiene de 1 a 4 átomos de carbono, un grupo hidroxilo, un átomo de halógeno, un grupo alcoxilo que tiene de 2 a 4 átomos de carbono, un grupo amino, un grupo nitro, un grupo ciano o un grupo alquilo halogenado, y * representa un átomo de carbono asimétrico, y un éster de (R o S)-ß-aminoácido ópticamente activo representado por la fórmula (III): en la que R tiene el mismo significado definido antes, R 1 representa un grupo alquilo que tiene de 1 a 10 átomos de carbono que puede estar sustituido con un átomo de halógeno, un grupo hidroxilo, un grupo alcoxilo que tiene de 1 a 4 átomos de carbono, un grupo dialquilamino o un grupo ciano, y * representa un átomo de carbono asimétrico, con tal que tenga una configuración absoluta inversa a la del compuesto de fórmula (II), que comprende hacer reaccionar selectivamente agua y uno de los enantiómeros de un éster de ß-aminoácido representado por la fórmula (I): en la que R y R 1 tienen los mismos significados definidos antes, que es una mezcla racémica, en presencia de una lipasa en al menos un disolvente orgánico seleccionado entre el grupo constituido por un hidrocarburo alifático, un hidrocarburo aromático, un éter y una cetona, en el que la cantidad de agua que se debe usar es de 0,1 a 10 mol en relación a 1 mol del éster de ß-aminoácido que es una mezcla racémica.
Abstract:
A 3-substituted oxyglutaric diester compound represented by the following formula (I): (I) [wherein R1's may be the same or different and each represents (un)substituted alkyl; and R2 represents (un)substituted alkyl, (un)substituted alkenyl, (un)substituted aralkyl, or (un)substituted aryl]; and an optically active 3-substituted oxyglutaric monoester compound represented by the formula (IV): (IV) (wherein R1 and R2 are the same as defined above).
Abstract:
A process in which a racemic mixture of an N-substituted .szlig.-amino acid alkyl ester or N-substituted 2-homopipecolic acid ester represented by the general formula (I): (I) (wherein Ar, R1, R2, R3, R4, and R5 are as defined in the description) is subjected to selective hydrolysis of only either of the enantiomers in the presence of a hydrolase to yield an optically active, N- substituted ((R) or (S))-.szlig.-amino acid or optically active, N-substitut ed ((R) or (S))-2-homopipecolic acid represented by the general formula (II): (II) and simultaneously obtain the unreacted, optically active, N-substitute d ((S) or (R))-.szlig.-amino acid alkyl ester or unreacted, optically active, N- substituted ((S) or (R))-2-homopipecolic acid ester represented by the gener al formula (III): (III) which has the absolute configuration opposite to that o f the compound represented by the general formula (II).
Abstract:
The present invention relates to a process for preparing an optically active (S or R)-²-amino acid represented by the formula (II): wherein R represents an alkyl group, alkenyl group, alkynyl group, cycloalkyl group, aralkyl group, aryl group or heteroaryl group each of which may have a substituent(s), and * represents an asymmetric carbon atom, and an optically active (R or S)-²-amino acid ester represented by the formula (III): wherein R has the same meaning as defined above, R 1 represents an alkyl group which may have a substituent(s), and * represents an asymmetric carbon atom, provided that it has a reverse absolute configuration to that of the compound of the formula (II), which comprises selectively hydrolyzingwater and one of enantiomers of a ²-amino acid ester represented by the formula (I): wherein R and R 1 have the same meanings as defined above, which is a racemic mixture, in the presence of a hydrolase in an organic solvent.
Abstract:
The present invention relates to a process for preparing an optically active (S or R)-²-amino acid represented by the formula (II): wherein R represents an alkyl group, alkenyl group, alkynyl group, cycloalkyl group, aralkyl group, aryl group or heteroaryl group each of which may have a substituent(s), and * represents an asymmetric carbon atom, and an optically active (R or S)-²-amino acid ester represented by the formula (III): wherein R has the same meaning as defined above, R 1 represents an alkyl group which may have a substituent(s), and * represents an asymmetric carbon atom, provided that it has a reverse absolute configuration to that of the compound of the formula (II), which comprises selectively hydrolyzingwater and one of enantiomers of a ²-amino acid ester represented by the formula (I): wherein R and R 1 have the same meanings as defined above, which is a racemic mixture, in the presence of a hydrolase in an organic solvent.
Abstract:
The present invention is to provide a 3-substituted oxyglutaric acid diester compound represented by the following formula (I): wherein R may be the same or different from each other, and represents a substituted or unsubstituted alkyl group, R represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted aryl group, and an optically active 3-substituted oxyglutaric acid monoester compound represented by the following formula (IV) : wherein R and R have the same meanings as defined above, and processes for preparing the same.