Hydrochloric Acid → 5-Methoxy-benzofuran-2-carboxylic acid {(S)-1-[3-hydroxy-6-methyl-1-(pyridine-2-sulfonyl)-azepan-4-ylcarbamoyl]-3-methyl-butyl}-amide

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Reaction Steps

To {(S)-1-[3-hydroxy-6-methyl-1-(pyridine-2-sulfonyl)-azepan-4-ylcarbamoyl]-3-methyl-butyl}-carbamic acid tert-butyl ester (0.13 g, 0.28 mmol) was added HCl/dioxane (4M, 2.8 ml, 11.2 mmol). The mixture was stirred at RT for 2 h before solvents and excess amount of HCl was removed on rotavapor. The result white solid was dissolved in 5 ml DMF. To the solution was added 5-methoxy-benzofuran-2-carboxylic acid (63.4 mg, 0.33 mmol), HBTU (125 g, 0.33 mmol) and NMM (0.14 g, 1.34 mmol). The mixture was stirred at RT overnight. DMF was then removed and the residue was re-dissolved in EtOAc (50 ml), washed with 10% NaHCO3 (50 ml×2) and brine (50 ml). The combined organics were concentrated by rotary evaporation. Purification by column chromatograghy gave the title compound (110 mg in 69% yield, 2 steps): MS (M+H+):573.4; 1H-NMR (400 Hz, CDCl3): d=8.74–8.66(dd, 1H), 7.96–6.97(m, 9H), 4.72(m, 1H), 4.18–3.21(m, 7H), 2.81(m, 1H), 2.04–1.74(m, 6H), 1.25(m, 2H), 0.99–0.87(m, 9H).

Provenance & Evidence