5-acyI-4-amino

A/-Carbamoylase Combined with A/-Acyi Amino Acid Racemase to Produce L-Homophenyiaianine... 

Synthesis of Oxazoies and a-C-Acyi Amino Acid Esters... 

Wenn das bei der Hydrierungdes 4-Acylamino-l,2-oxazoIs als Zwischenprodukt gebildete a,/ -ungesattigte oc-Acylamino-/J-amino-keton vor der Cyclisierung mit einem primaren Amin um-gesetzt wird, erhalt man 1-substituierte 4-AcyI-imidazole380 ... 

Anstelle von Phenylcyanat konnen auch Alkylcyanate wie 2,2,2-Trichlor- und 2,2,2-Trifluor-ethylcyanat mit Carbonsaure-hydraziden zu 2-Amino-l,3,4-oxadiazolen cyclisieren2 4. Diese Reaktion erfolgt tiber eine Addition des Alkylcyanats zu Kohlensa ure-(2-acyI-hydrazid)-alkylamiden, die beim Erwarmen 2-Amino-l,3,4-oxadiazole liefern2 4. 

The photolysis of 0-acyI benzophenone oximes in isopropyl alcohol in the presence of r-butyl thiol leads to overall reductive decarboxylation. Yields for simple aliphatic and amino acids are reported to be good. It is especially noteworthy that reductive decarboxylation of 2- and 4-quinolinecarboxylic acids (although not of the 3-isomer, nor 1- or 2-naphthalenecarboxyIic acids) was achieved in moderate yield by this method (equation 9). 

C. Anodic Oxidation of Af-Acyi and Af-Carboalkoxy c -Amino Acids... 

Pyridyl-substituted pyrimidines 44 could be obtained by reacting pyridylacetic acid derivatives with 1,3,5-triazine (94AP(327)533I. 4-Function-alised imidazoline derivatives of type 45 which are conveniently available from A(-acyI-a-amino ketones have been found to undergo rearrangement to arylpyrimidine derivatives 46 (93JOC(58)6354. ... 

Synonyms Avocado aikyi amidopropyi dimethyi benzyi ammonium chioride Benzenemethanaminium, N-(3-aminopropyi)-N,N-dimethyi-, N-avocado oii acyi derive., chiorides 1-Propanaminium, N,N-dimethyi-N-phenyimethyi-3-[1-oxoavocado) amino]-, chioride... 

In addition, several amino acid-adding systems have become known in the amino-acylaciun of viral RNAs (35), proteins (36), muropeptides (37). and polymers, such as tcichoic acids (38). Whereas the first three systems employ specific aminoacyl-tRNAs, the last system structurally resembles acyi-coenzyme A synthetases, and it transfers an activated D-Ala to an acyl earner protein transporter (39). Peptide bond formation occurs in all of these systems by separate transferases. 

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