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Dual late‐stage functionalization of RGD peptides by cross‐coupling and PEGylation. Cross‐coupling was performed similarly as described previously.23 The tBu protecting group is cleaved under the applied reaction conditions, which does not cause any side reactions during PEGylation. sSPhos=sodium 2′‐dicyclohexylphosphino‐2,6‐dimethoxy‐1,1′‐biphenyl‐3‐sulfonate hydrate; DIPEA=N,N‐diisopropylethylamine; TFA=trifluoroacetic acid; TIS=triisopropylsilane; NHS=N‐hydroxysuccinimide.
