Scheme 3. Synthesis of amino-BODIPY 7 and its conjugates 4–6. (i) 7.0 M NH3/MeOH, DCM 70 °C, on; (ii) DMAP, TEA, DCM, rt, 3 h; (iii) DMF, 60 °C, on; (iv) TEA, DMAP, 13, DCM, rt, 3 h. (v) K2CO3, THF/MeOH 3 : 1, rt, on; (vi) DMAP, TEA, DCM, rt, on.
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