反应详情

To the 8 L of 1:1 methanol/water mixture containing the resultant compound from Example 3C was added 60 g of W-24 raney nickel. The resulting suspension was pressurized under 50 psi of hydrogen and was allowed to shake on a Parr shaker for 24 h, at which time an additional 20 g of raney nickel catalyst was added. After 6 h under 50 psi of hydrogen, the catalyst was removed by filtration and the solution was concentrated to dryness. To the dry white solid was added ethyl acetate (6 L) and heptane (4 L) and the solution was vigorously stirred with a mechanical stirrer overnight. The white suspension was removed by filtration yielding 530 g (88%) of the desired product as an amorphous powder that was contaminated with approximately one equivalent of NaBr. The compound was used without any additional purification: IR (KBr) 1740, 1215, 1050 cm-1. 1H NMR (DMSO D-6) δ2.48-2.54 (m, 1H), 2.74- 2.87 (m, 2H), 2.91-3.04 (m, 2H), 3.48 (s, 3H), 7.12-7.32 (m, 5H); 13C NMR (75 MHz, D2O/DMSO D-6) δ38.18, 44.80, 52.67, 52.82, 127.42, 129.13, 129.34, 138.14, 176.84.

1. customthe catalyst was removed by filtration
2. concentrationthe solution was concentrated to dryness
3. additionTo the dry white solid was added ethyl acetate (6 L) and heptane (4 L)
4. customThe white suspension was removed by filtration