Scheme 1.
Synthesis of biotin-linked chlorin derivatives. Reaction conditions: (i) H2N(CH2)6NHBoc, CH2Cl2; (ii) trifluoroacetic acid (TFA); (iii) biotin, DMTMM; (iv) Zn(OAc)2 in MeOH; and, (v) InCl3 in MeOH.
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