Hydrochloric Acid → 3-(2-tert-Butoxycarbonyl-ethylsulfamoyl)-benzoic acid methyl ester

Beteiligte Stoffe

Reaktionsschritte

To a stirred solution of methyl 3-(chlorosulfonyl)benzoate (5.0 g, 21.31 mmol) in pyridine (50 ml), was added dropwise a solution of tert-butyl 3-aminopropanoate hydrochloride (5.11 g, 23.44 mmol) in pyridine (10 ml) at 0° C. The resulting solution was allowed to warm to RT and stirred for 4 h. 1N HCl (50 ml) was added to the reaction mixture and the aqueous phase was separated and extracted with DCM (3×20 ml). The combined organic fractions were dried (MgSO4) and concentrated in vacuo to afford a viscous amber oil. Purification by chromatography on silica eluting with 0-100% EtOAc in iso-hexane afforded the title compound as a colourless oil. 1H NMR (400 MHz, CDCl3) δ 8.53 (1H, s), 8.27 (1H, d), 8.08 (1H, d), 7.63 (1H, t) 5.38 (1H, t), 3.97 (3H, s), 3.20 (2H, m), 2.48 (2H, t), 1.43 (9H, s).

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