Hydrochloric Acid → 4-({4-[(4-tert-Butoxycarbonylamino-1-methyl-1H-pyrrole-2-carbonyl)-amino]-1-methyl-1H-imidazole-2-carbonyl}-amino)-1-methyl-1H-imidazole-2-carboxylic acid ethyl ester

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Reaction Steps

The Boc imidazole dimer (39) (0.253 g, 0.65 mmol) was deprotected using 4M HCl in dioxane as described in general procedure C. The resulting residue (39′) was dissolved in dry DMF (5 mL) and the Boc protected pyrrole acid (2) (0.156 g, 0.65 mmol) was added. The resulting solution was treated with EDCI (1.5 equiv.) and DMAP (2 equiv.) and reacted as described in general procedure A. This yielded a brown foam 0.109 g (32%). LCMS (method 2) rt=1.87 min; m/z (ES+) 515 (M+1).

Provenance & Evidence