Scheme 2. Synthesis of Fluorescent 23-HBA Probes 26a–j.
Reagents and conditions: (a) BnBr, K2CO3, DMF, rt, 12 h; (b) Corresponding coumarin acids, oxalyl chloride, triethylamine, cat. DMF, CH2Cl2, rt, 0.5 h; (c) H2, 10% Pd/C, THF/MeOH, 50 °C, 1 h.
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