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. Author manuscript; available in PMC: 2010 Sep 16.
Published in final edited form as: J Am Chem Soc. 2009 Sep 16;131(36):13072–13079. doi: 10.1021/ja903733z

Scheme 10.

Scheme 10

Synthesis of 9. (a) 30% piperidine/DMF; (b) Fmoc-Lys(Alloc)-OH/HBTU/HOBt/NMM; (c) Tetrakis-(triphenylphosphine)-palladium(0), AcOH/NMM/CH2Cl2; (d) 4-Ethylbenzoic acid/HBTU/HOBt/NMM; (e) Fmoc-Phe-OH/HBTU/HOBt/NMM; (f) MOA/HBTU/HOBt/NMM; (g) TFA/H2O/TIS (95:2.5:2.5).