Scheme 5.
Synthesis of l-citrulline derivatives 21a–c. Reagents and conditions: (a) HCl 4 M in dioxane, r.t., 1 h; (b) 3-picolylamine, HATU, TEA, DCM, r.t., 5 h.; (c) 4-aminopyridine, HATU, TEA, DCM, r.t., 5 h.
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