2-phenylmethoxypropanamide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a suspension of 2-benzyloxy-propionamide (Helv. Chim. Acta, 1971, 845-851) (26.6 mmol, 4.77 g) in acetonitrile (100 mL) at room temperature was added dropwise chlorosulfonyl isocyanate (26.6 mmol, 4.1 mL) in acetonitrile (20 mL). After 1 h the reaction was concentrated, then carefully quenched with water (20 mL) and allowed to stir at room temperature for 1 h. The precipitated solid was filtered, collected and air-dried to obtain (2-benzyloxy-propionyl)-urea (62%, 3.66 g); NMR 1.2 (d, 3H), 4.0 (t, 1H), 4.4 (dd, 2H), 7.3 (m, 5H), 7.7 (s, 1H), 10.0 (S, 1H). The above reaction conditions were followed to convert (2-benzyloxy-propionyl)-urea to 2-benzyloxy-N-ureidocarbonyl-propionamide, using the above compound, (2-benzyloxy-propionyl)-urea (16.5 mmol, 3.66 g), chlorosulfonyl isocyanate (28.8 mmol, 2.5 mL), and acetonitrile (80 mL). The yield of 2-benzyloxy-N-ureidocarbonyl-propionamide was 59% (2.56 g); NMR 1.4 (d, 3H), 4.2 (t, 1H), 4.6 (dd, 2H), 7.4 (m, 5H), 9.8 (s, 1H), 11.1 (s, 1H). After 1 h the reaction was concentrated carefully quenched with water (20 mL) The precipitated solid was filtered collected air-dried