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. Author manuscript; available in PMC: 2018 Jun 2.
Published in final edited form as: Faraday Discuss. 2017 Jun 2;198:279–300. doi: 10.1039/c7fd00003k

Figure 2.

Figure 2

Catalyst-modified amino acid complexes. Compounds 4 and 5 exhibit intra- and inter-molecular hydrogen-bonding and 4 further contains an internal proton source as it features a di-Tyrosine substituent on the bipyridine (di-Tyr).37 Notably 6 is capable of being incorporated into a peptide as it is stable towards common Fmoc SPPS.