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A. Synthesis of dendron conjugate 11. B. Synthesis of QD conjugates 12 and 13. Reagents and conditions: (a) TFA:DCM (1:1); (b) EDC, N-hydroxysuccinimide, DMF; (c) LiOH, MeOH, H2O (c) APEC (1b), DIEA, PyBOP, DMSO; (e) Solid-supported BH4+ bead, DMF, EtOH, H2O; (f) CdS/ZnS QD (toluene-soluble), DMSO, EtOH, 60-80°C. The degree of dendron substitution of the QDs, variable n, was estimated to be equal to ~100-150 on conjugate 12 and ~100-150 on conjugate 13 (see text).
