glucosamine tetra-O-acetate → 2-nitro-4-(3'-ethyl-2', 4', 6'-triiodophenyl)-benzoyl-1,3,4,6-tetra-O-acetyl-D-glucosamine

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Freidel-Crafts acylation is performed on 2′,4′,6′-triiodo-3-nitrobiphenyl-4-carboxylic acid (6) in the presence of AlCl3 and CH3COCl to yield 2′,4′,6′-triiodo-3′-acetyl-3-nitrobiphenyl-4-carboxylic acid (12). C 13 ⁢ H 6 ⁢ I 3 ⁢ N ⁢   ⁢ O 4 ⁢ → C ⁢   ⁢ H 3 ⁢   ⁢ C ⁢   ⁢ O ⁢   ⁢ Cl Al ⁢   ⁢ Cl 3 ⁢ C 15 ⁢ H 8 ⁢ I 3 ⁢ N ⁢   ⁢ O 5 2′,4′,6′-triiodo-3′-acetyl-3-nitrobiphenyl-4-carboxylic acid (12) is then reacted with a zinc mercury amalgam and hydrochloric acid and heated to yield 2′,4′,6′-triiodo-3′-ethyl-3-nitrobiphenyl-4-carboxylic acid (13). C 15 ⁢ H 8 ⁢ I 3 ⁢ N ⁢   ⁢ O 5 ⁢ → Δ Zn ( Hg ) ,   ⁢ H ⁢   ⁢ Cl ⁢ C 15 ⁢ H 10 ⁢ I 3 ⁢ N ⁢   ⁢ O 4 2′,4′,6′-triiodo-3′-ethyl-3-nitrobiphenyl-4-carboxylic acid (13) is reacted with thionyl chloride to yield 2′,4′,6′-triiodo-3′-ethyl-3-nitrobiphenyl-4-carbonyl chloride (14). C 15 ⁢   ⁢ H 10 ⁢ I 3 ⁢ N ⁢   ⁢ O 4 ⁢ → S ⁢   ⁢ O ⁢   ⁢ Cl 2 ⁢ C 15 ⁢   ⁢ H 9 ⁢ Cl ⁢ I 3 ⁢ N ⁢   ⁢ O 3 1,3,4,6-tetra-O-acetyl-D-glucosamine (9) is reacted with 2′,4′,6′-triiodo-3′-ethyl-3-nitrobiphenyl-4-carbonyl chloride (14) to yield 2-nitro-4-(3′-ethyl-2′,4′,6′-triiodophenyl)-benzoyl-1,3,4,6-tetra-O-acetyl-D-glucosamine (15). C14H21NO9+C15H9ClI3NO3→C29H29I3N2O12 2-nitro-4-(3′-ethyl-2′,4′,6′-triiodophenyl)-benzoyl-1,3,4,6-tetra-O-acetyl-D-glucosamine (15) is treated with stannous chloride and hydrochloric acid to yield 2-amino-4-(3′-ethyl-2′,4′,6′-triiodophenyl)-benzoyl-D-glucosamine (16). C 29 ⁢   ⁢ H 29 ⁢ I 3 ⁢ N 2 ⁢ O 12 ⁢ → Sn ⁢   ⁢ Cl 2 ,   ⁢ H ⁢   ⁢ Cl ⁢ C 21 ⁢   ⁢ H 23 ⁢ I 3 ⁢ N 2 ⁢   ⁢ O 6 Example 2 is similar in general structure to Example 1, with the additional presence of a short alkyl chain attached to the radio-opaque tri-iodophenyl moiety at the C-3′ position to further increase lipophilicity of the molecule and enhance cell membrane permeability. The computed logP of Example 2 is 5.31.

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