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Synthetic route of 7–8 and 11–13. Reagents and conditions: (a) HBTU, HOBt, DIPEA, DCM, rt., quant.; (b) TFA, DCM, rt., 87%; (c) (tert-butoxycarbonyl)-l-phenylalanine, HBTU, HOBt, DIPEA, DCM, rt., 81%; (d) TFA, DCM, rt., quant.; (e) CH3COCl, Et3N, DCM, rt., 91%.
