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A) Problems encountered with unprotected Rho in peptide chemistry. B) Synthesis of N,N′‐Boc‐protected Rho. a) Ac2O, H2SO4, 120 °C (99 %); b) EtOH, EDC, CH2Cl2 (94 %); c) NaOEt, EtOH; d) Tf2O, pyridine, CH2Cl2 (57 %); e) BocNH2, Pd2dba3, Xantphos, Cs2CO3, dioxane, 100 °C (82 %); f) NaOH, THF (95 %).
