Dicyclohexylcarbodiimide → N-(2-morpholinyl-ethyl)-5-[4,5-bis(4-methoxyphenyl)-1H-imidazol-2-ylthio]-pentanamide

Participants

Reaction Steps

A solution of 5-[4,5-bis(4-methoxyphenyl)-1H-imidazol-2-ylthio]pentanoic acid (1.91 g, 4.63 mmol) and 1-hydroxy-1H-benzotriazole hydrate (890 rag, 6.59 mmol) in tetrahydrofuran (20 mL) was cooled to 0° C., and treated with 2-aminoethylmorpholine (1.0 mL, 7.62 mmol). After 20 minutes, dicyclohexylcarbodiimide (1.42 g, 6.88 mmol) was added in small portions over 20 minutes. This mixture was allowed to stir an additional 48 hours, then poured into ethyl acetate (250 mL), filtered, and washed with water (200 mL). The phases were separated, and the aqueous phase was saturated with sodium chloride and reextracted with methylene chloride (200 mL). The organic phases were combined, dried over anhydrous sodium sulfate and evaporated. The mixture was separated by flash chromatography to afford the product, N-(2-morpholinyl-ethyl)-5-[4,5-bis(4-methoxyphenyl)-1H-imidazol-2-ylthio]-pentanamide, as an oil (1.77 g, 3.37 mmol, 73%). 1H NMR (CDCl3): 7.42 (4H, br d, J=9 Hz); 6.82 (4H, d, J=9 Hz); 6.22 (1H, br t, J=4 Hz); 3.80 (6H, s); 3.65-3.60 (4H, m); 3.15 (2H, q, J=6 Hz); 2.98 (2H, t, J=7 Hz); 2.38-2.24 (8H, m); 1.96-1.85 (2H, m); 1.70-1.60 (2H, m).

Provenance & Evidence