The journal of peptide research : official journal of the American Peptide Society, 53(2), 109-119 (1999-04-09)
We synthesized short chromogenic peptidyl-Arg-p-nitroanilides containing either (Galbeta)Ser or (Glcalpha,beta)Tyr at P2 or P3 sites as well as O-acetylated sugar moieties and studied their hydrolysis by bovine trypsin, papain, human tissue kallikrein and rat tonin. For comparison, the susceptibility to
6-Oxoestradiol (2) was protected as its bis[(2-trimethylsilylethoxy)methyl] ether (4) and converted to the corresponding oxime (4). The oxime (4) on reduction with zinc in ethanol afforded the bis-SEM ether of 6-alpha-aminoestradiol (5) in 96% epimeric excess. Subsequently, 5 was hydrolyzed
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