Scheme 2.
Reagents and conditions: (a) POCl3, 120 °C; (b) NH2(CH2)3NHBoc; (c) 4 N HCl in 1,4-dioxane, MeOH, rt; (d) Br(CH2)3NHBoc, KOH, TBAI (cat.), toluene, H2O,
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