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Synthetic scheme for generating N,N-disubstituted alkylguanidinobutanoic acid and N-arylguanidine analogues. Reagents and Conditions: (i) DEAD, Ph3P, THF, 0 °C-RT, 3–16 h; (ii) DIPEA, CH3CN, RT, 24 h; (iii) 4 M HCl/1,4-dioxane, 24–72 h, 0.29%–41% overall. Adapted with permission from [112]. Copyright 2005 American Chemical Society.
