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Representative crude HPLC traces for conversion of N-allylamine 7 to amide 8 with different coupling agents as described in Table 3. Peptide was deprotected and cleaved from Rink amide resin with TFA, and monitored at 220 nm. (a) N-allyl peptide, (b) PyBrOP/DMAP, (c) TFFH/HOAt, (d) HATU/HOAt, (e) DIC/HOAt, (f) triphosgene.
