Scheme 8.
Reagents and conditions: (a) SOCl2, C6H6, 80 °C, 12 h; (b) R-NH2, TEA, dioxane, rt, 3 h; (c) H-Gly-OtBu.HCl, TEA, dioxane, rt, 3 h; (d) TFA, DCM, rt, 18 h.
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