Acetic Acid → HCID 18511143, compound

Participants

Reaction Steps

To a 25-mL, round-bottomed flask was added ethyl 3-amino-5-phenylpyrrole-2-carboxylate (Example 66(b)) (1.1 g) and MeOH (5 mL). To the reaction flask was added 1,3-bis(tertbutoxycarbonyl)-2-methyl-2-thiopseudourea (Aldrich Chemical Company) (1.6 g, 5.5 mmol), followed by glacial acetic acid (1.43 mL, 25 mmol). The reaction mixture was stirred at room temperature under N2 for 28 h. A heavy precipitate formed and was collected by filtration, washed with H2O (3×10 mL) and dried in a vacuum oven overnight to give 0.71 g (32% from Example 66(a)) of the title compound as an off-white solid. 1H NMR (DMSO-d6; 400 MHz): δ 1.38 (t, 3, J=7.00), 1.44 (s, 9), 1.46 (s, 9), 4.38 (q, 2, J=6.97), 7.31-7.46 (m, 3), 7.76 (d, 2, J=7.86), 11.06 (br s, 1), 11.25 (s, 1), 11.61 (s, 1), 11.95 (br s, 1); MS m/z: 473 (M+1), 471 (M−1).

Provenance & Evidence