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Synthesis of santacruzamate A linker analogues. Reagents and conditions: (i) ethyl chloroformate, K2CO3, H2O, 0 °C to rt; (ii) phenethylamine, aniline, benzenemethanamine, or benzenebutanamine, EDC-HCl, TEA, cat. DMAP, CH2Cl2, 0 °C to rt; (iii) ethylchloroformate, TEA, CH2Cl2.
