Selective peptide chain extension at the N-terminus of aspartic and glutamic acids utilizing 1-(N-protected-alpha-aminoacyl)benzotriazoles.


Diverse N-protected di-(3a-d, 3a + a', 5a-d, 5d + d', and 7a-g) and tripeptides (10a-h) were synthesized under mild reaction conditions in good yields (65-97%) by acylation with 1-(N-protected-alpha-aminoacyl)benzotriazoles of the amino groups of free aspartic and glutamic acids. Complete retention of chirality was demonstrated by parallel experiments… (More)


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