Scheme 1.
Synthesis of 5.
Reagents and conditions: (a) (i) N,N’-di-iso-propylcarbodiimide, N-hydroxysuccinimide, CHCl3, r.t. 2 h; (ii) 2-N,N-dimethylaminoethylamine, pyridine, CHCl3, r.t, 1 day; (b) H2TPP(p-BrCH2)4, CHCl3, reflux, 1 day.
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