Untersuchungen zur proteasekatalysierten und chemischen Peptidbindungskn�pfung mit ?-trifluormethylsubstituierten ?-Aminos�uren
作者:K. Burger、Kerstin M�tze、Wolfgang Hollweck、Beate Koksch、Peter Kuhl、H.-D. Jakubke、J�rgen Riede、Annette Schier
DOI:10.1002/prac.19933350404
日期:——
Subtilisin, alpha-chymotrypsin and papain catalyzed hydrolyses of alpha-trifluoromethyl substituted N-benzyloxycarbonyl amino acid methylesters (Z-TFM-Xaa-OMe) 1 can be achieved only in the case of 3,3,3-trifluoroalanine. Enzymatic incorporation of Z-TFM amino acids 2 into N-terminal position of dipeptides also fails. In contrary, dipeptides with a TFM amino acid moiety in N-terminal position, e. g. TFM-Phg-L-Phe-OMe 5, react with H-Leu-NH2 to give the corresponding tripeptides 6 in high yield. Z protected dipeptide derivatives 8 with N-terminal TFM amino acids can be obtained via 4-trifluoromethyl-5-(4H)-oxazolones 7.