Trifluoroacetic acid → N-[1-(4-fluoro-phenyl)-azetidin-3-ylmethyl]-4-(3-phenyl-indole-1-sulfonyl)-benzamide

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Reaction Steps

Add trifluoroacetic acid (2 mL) to [1-(4-fluoro-phenyl)-azetidin-3-ylmethyl]-carbamic acid tert-butyl ester (135 mg, 0.482 mmol) causing much gas evolution. Rotary evaporate the reaction solution (40° C.; azeotroping 3× with CH2Cl2). Dissolve this material in anhydr CH2Cl2 (3 mL). Add 4-(3-Phenyl-indole-1-sulfonyl)-benzoic acid (200 mg, 0.53 mmol, 1.1 equiv), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC; 140 mg, 0.73 mmol, 1.5 equiv), and 4-(dimethylamino)pyridine (DMAP; 270 mg, 2.3 mmol, 4.7 equiv). After stirring 16 h, transfer the reaction solution to a column of silica gel (80 mm×20 mm dia.) and elute (10-45% EtOAc/hex) to yield 31 mg (12%) of N-[1-(4-fluoro-phenyl)-azetidin-3-ylmethyl]-4-(3-phenyl-indole-1-sulfonyl)-benzamide as a light-yellow foam. MS (m/e): 539.99 (M+1); 538.16 (M−1).

Provenance & Evidence