http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0099960-A1

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assignee http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_23e301cc66e48e50b52885ba78f02aa4
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b4eda8366c5110f77a0cdc4efc6079e9
classificationCPCAdditional http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P20-55
classificationCPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07K5-0613
classificationIPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C231-00
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http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00
filingDate 1983-04-07-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fb3ba5fc437f6b42600399126d6c9afc
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6901e40a810d31528b0198fd48c84e31
publicationDate 1984-02-08-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0099960-A1
titleOfInvention Process for the preparation of lower alkyl esters of N-L-alpha-aspartyl-L-phenyl alanine, and intermediates for their manufacture
abstract a) einen L-Asparaginsäure-4-(arylmethyl)-ester mit einem 1,3-Diketon oder Acylessigester in Gegenwart einer Base umsetzt, das dabei gebildete Salz von L-N-(1-Alkyl-2- acyl-vinyl- oder 1-Alkyl-2-alkoxycarbonyl-vinyl)-asparaginsäure-4-(arylmethyl)-ester mit einem organischen oder anorganischen Säurehalogenid der Formel X-A, worin X ein Halogenatom, Chlor oder Brom bedeutet, oder mit einem Säureanhydrid umsetzt und erhaltenes reaktives Anhydrid von L-N-(1-Alkyl-2-acyl-vinyl- oder 1-Alkyl-2-alkoxycar- bonylvinyl)-asparaginsäure-4-(arylmethyl)-ester der Formel 1n worinn R einen Alkylrest mit 1 bis 6 C-Atomen . R' einen Alkyl- oder Alkoxyrest mit 1 bis 6 C-Atomen Ar den Phenylrest oder einen Nitro-, Halogen- oder Alkyl-phenyl-rest und A einen Acyl- oder Alkoxycarbonylrest mit 2 bis 12 C-Atomen oder den Rest einer Phosphor- oder Phosphorigsäure, Schwefelsäure, Schwefligsäure oder Sulfonsäure bedeuten, mit einem L-Phenylalanin-niederalkylester umsetzt oder b) ein Salz von L-N-(1-Alkyl-2-acyl-vinyl- oder 1-Alkyl-2-alkoxycarbonylvinyl)-asparaginsäure-4-(arylmethyl)-ester mit einem Phosphorazo-L-phenylniederalkyl-ester umsetzt und den nach a) oder b) erhaltenen N-L-a-N'-(1-Alkyl-2-acyl- vinyl- oder 1-Alkyl-2-alkoxycarbonylvinyl)-aspartyl-L-phenylalanin-1-niederalkyl-4-(arylmethyl)-ester mit einer starken Säure behandelt, wobei die N-(1-Alkyl-2-acyl-vinyl- oder 1-Alkyl-2-alkoxycarbonyl-vinyl)-Schutzgruppe abgespalten wird, und den erhaltenen N-L-a-Aspartyl-L-phenylalanin-1- niederalkyl-4-(arylmethyl)-ester einer katalytischen Hydrierung unterwirft, wobei die 4-(Arylmethyl)-estergruppe selektiv gespalten und N-L-α-Aspartyl-L-phenylalanin-1-niederalkylester erhalten wird. The invention relates to a selective process for the preparation of NLa-aspartyl-L-phenylalanine-1-lower alkyl ester, which is characterized in that a) reacting an L-aspartic acid 4- (arylmethyl) ester with a 1,3-diketone or acylacetic ester in the presence of a base, the salt of LN- (1-alkyl-2-acyl-vinyl- or 1- Alkyl (2-alkoxycarbonyl-vinyl) -aspartic acid 4- (arylmethyl) ester with an organic or inorganic acid halide of the formula XA, in which X represents a halogen atom, chlorine or bromine, or with an acid anhydride and reactive anhydride obtained from LN- (1-alkyl-2-acyl-vinyl or 1-alkyl-2-alkoxycarbonyl vinyl) -aspartic acid 4- (arylmethyl) ester of the formula 1 wherein R is an alkyl radical with 1 to 6 carbon atoms . R 'is an alkyl or alkoxy radical having 1 to 6 carbon atoms Ar is the phenyl radical or a nitro, halogen or alkylphenyl radical and A is an acyl or alkoxycarbonyl radical having 2 to 12 carbon atoms or the residue of a phosphoric or phosphorous acid, sulfuric acid, sulfuric acid or sulfonic acid, is reacted with an L-phenylalanine lower alkyl ester or b) a salt of LN- (1-alkyl-2-acyl-vinyl or 1-alkyl-2-alkoxycarbonylvinyl) -aspartic acid 4- (arylmethyl) ester is reacted with a phosphorazo-L-phenyl-lower alkyl ester and the after a) or b) obtained NLa-N '- (1-alkyl-2-acyl-vinyl or 1-alkyl-2-alkoxycarbonylvinyl) -aspartyl-L-phenylalanine-1-lower alkyl-4- (arylmethyl) ester treated with a strong acid, the N- (1-alkyl-2-acyl-vinyl or 1-alkyl-2-alkoxycarbonyl-vinyl) protective group being split off, and the NLa-aspartyl-L-phenylalanine-1-lower alkyl obtained -4- (arylmethyl) ester is subjected to a catalytic hydrogenation, the 4- (arylmethyl) ester group being selectively cleaved and NL-α-aspartyl-L-phenylalanine-1-lower alkyl ester being obtained. n n n R einen Alkylrest mit 1 bis ε C-Atomen R' einen Alkyl- oder Alkoxyrest mit 1 bis 6 C-Atomen Ar den Phenylrest oder einen Nitro-, Halogen- oder Alkyl-phenyl-rest und R" den Methylrest oder einen Niederalkylrest mit 2 bis 4 C-Atomen bedeuten. The invention also relates to the synthesis intermediates, namely the NLa-N '- (1-alkyl-2-acyl-vinyl or 1-alkyl-2-alkoxy-carbonyl-vinyl) aspartyl-L-phenylalanine-1-lower alkyl-4 - (arylmethyl) esters of formula II, (continued on next page) wherein R is an alkyl radical with 1 to ε C atoms R 'is an alkyl or alkoxy radical having 1 to 6 carbon atoms Ar is the phenyl radical or a nitro, halogen or alkylphenyl radical and R "is the methyl radical or a lower alkyl radical having 2 to 4 carbon atoms.
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