1,2-Dichloroethane → tert-butyl 1-[[4-[(Z)-N'-[4-phenyl-5-(trifluoromethyl)thiophene-2-carbonyl]oxycarbamimidoyl]phenyl]methyl]azetidine-3-carboxylate

Participants

Reaction Steps

A mixture of 4-phenyl-5-(trifluoromethyl)thiophene-2-carboxylic acid (408 mg, 1.50 mmol), (Z)-tert-butyl 1-(4-(N′-hydroxycarbamimidoyl)benzyl)azetidine-3-carboxylate (Int.1, 458 mg, 1.50 mmol), HOBT (345 mg, 2.250 mmol), Hunig's Base (1.05 mL, 6.00 mmol), and EDC (431 mg, 2.25 mmol) in N,N-dimethylformamide (7.5 mL) was stirred at room temperature for 18 h. The reaction mixture was partitioned between ethyl acetate (120 mL) and a saturated aqueous solution of sodium bicarbonate (60 mL). The organic layer was washed with water (2×120 mL), washed with brine (120 mL), and dried over anhydrous magnesium sulfate. Concentration under reduced pressure afforded (Z)-tert-butyl 1-(4-(N′-(4-phenyl-5-(trifluoromethyl)thiophene-2-carbonyloxy)carbamimidoyl)benzyl)azetidine-3-carboxylate (744 mg, 1.33 mmol, 89% yield) as a light peach colored solid that was used in the next step without further purification. HPLC: ret. time=3.26 minutes (YMC Combi S-5 4.6×50 mm ODS column) eluting with 10-90% aqueous methanol+0.2% phosphoric acid over a 4 minute gradient. MS: (M+H)=560.25.

Provenance & Evidence