反应详情

The title compound was prepared as described in Example 9 starting with 7-(4-chlorobenzamido)-5,6-dihydro-6-hydroxy-5,5-dimethyl-7H-thieno[3,2-b]pyran (1.23 g, 3.64 mmol) and 90% nitric acid (1.5 mL) in acetic acid (20 mL) to give the product, 0.384 g (28%), as a yellow solid: mp 226°-229° C. dec; IR (KBr): 3315, 1655, 1535 and 1503 cm-1;MS: m/z 383 (MH+); 1H NMR (DMSO-d6): δ 1.25 (s, 3H), 1.44 (s, 3H), 3.90 (m, 1H, simplifies to d, J=8.9 Hz with D2O), 4.95 (m, 1H, simplifies to d, J=8.9 Hz, with D2O), 5.94 (d, J=6.0 Hz, 1H exchanges with D2O), 7.60 (d, J=8.6 Hz, 2H), 7.72 (s, 1H), 7.94 (d, J=8.6 Hz, 2H) and 9.11 (d, J=7.6 Hz, 1H, exchanges with D2O).

1. customto give the product, 0.384 g (28%)