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Synthesis of the reported compounds. Reagents and conditions: (i) N-hydroxysuccinimide, (HOSu, 1.1 equiv), N,N′-dicyclohexylocarbodiimide (DCC, 1 equiv), 1,1,3,3-tetramethylguanidine (TMG, 1.1 equiv), 24 h in dimethylformamide (DMF); (ii) 3,5-bis(trifluoromethyl)benzaldehyde, 20 h in isopropanol (i-PrOH); (iii) trifluoroacetic acid/ dichloromethane (TFA/DCM), 2 h.
