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Guanidinylating strategies described in this Synopsis. Reaction conditions: (a) (i) DCM, TEA, −78 °C; (ii) TFA, rt;76 (b) (i) dimethylformamide (DMF), TEA, rt; (ii) TFA, rt;77 (c) (i) DMF, DIEA, rt; (ii) TFA, rt;78 (d) 1,3-Dimethyl-2-imidazolidinone, 1-hydroxybenzotriazole, TEA, ammonium hydroxide, 50 °C.68
