Zusammenfassung
C(alpha)-tetrasubstituted amino acids are important building blocks in the design and preparation of novel peptidomimetics. We report on the functionalization of the C(alpha)-tetrasubstituted THF amino acid rac-5 by copper(I) catalyzed N-arylation reactions. The aryl bromide substituent of rac-5 is replaced by a variety of aliphatic and aromatic amines. Intramolecular N-arylation yielded only ...
Zusammenfassung
C(alpha)-tetrasubstituted amino acids are important building blocks in the design and preparation of novel peptidomimetics. We report on the functionalization of the C(alpha)-tetrasubstituted THF amino acid rac-5 by copper(I) catalyzed N-arylation reactions. The aryl bromide substituent of rac-5 is replaced by a variety of aliphatic and aromatic amines. Intramolecular N-arylation yielded only small amounts of a cyclic tripeptide 2, whereas cyclic tripeptide ethers 4 and 50 were obtained in an enantiomerically pure form from a palladium(0)-catalyzed intramolecular O-arylation
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