C([CH:8]([CH2:24][CH2:25][NH:26][CH2:27][CH2:28][CH2:29][CH2:30][NH:31][CH2:32][CH2:33][CH2:34][NH2:35])[N:9](C(OC(C)(C)C)=O)C(OC(C)(C)C)=O)(OC(C)(C)C)=O.N(CCCI)=[N+]=[N-]>[Pd]>[NH2:35][CH2:34][CH2:33][CH2:32][NH:31][CH2:30][CH2:29][CH2:28][CH2:27][NH:26][CH2:25][CH2:24][CH2:8][NH2:9]Monoquaternary spermine containing hydrophilic head-group was prepared in a similar way to compound 3. Briefly, TriBoc-Spermine was reacted with excess of 1-azido-3-iodo-propane in the presence of excess TBA. The resulting quaternarized derivative was hydrogenised under (Pd—C) and Boc protecting group were removed using gaseous HCl in dry methanol.
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