Acetic Anhydride → HCID 22643590, compound

Participants

Reaction Steps

The 2-amino-N-[[4-(5-methyl-3-phenylisoxazol-4-yl)phenyl]sulfonyl]acetamide (Example 79) (4.08 g, 10.9 mmol) was mixed in acetonitrile at room temperature. Triethylamine (3.03 g, 30.0 mmol) and acetic anhydride (1.23 g, 12.1 mmol) were added and the heterogeneous solution was stirred for 2 hours. The solution was vacuum filtered through a pad of diatomaceous earth and solvent was removed at reduced pressure. Water was added and the solution was stirred for 30 minutes. White crystals formed, were collected by vacuum filtration and dried to afford the desired product as a white solid (3.25 g, 78%): mp 218.2-219.3° C. 1H NMR (CD3OD/300 MHz) 8.01 (d, 2H, J=8.2 Hz), 7.42-7.36 (m, 7H), 3.85 (s, 2H), 2.50 (s, 3H), 1.95 (s, 3H). FABLRMS m/z 414 (M+H). Anal. Calc'd for C20H19N3O5S: C, 58.10; H, 4.63; N, 10.16. Found: C, 58.18; H, 4.66; N, 10.14.

Provenance & Evidence