反应详情

5,6-Dihydro-6-hydroxy-5,5-dimethyl-7-(2-oxopyrrolidin-1-yl)-7H-thieno[3,2-b]pyran (1.1 g, 4.11 mmol) was added to a mixture of sodium hydride (60% in mineral oil, 0.172 g, 4.32 mmol) in N,N-dimethylformamide (20ml) at 0° C. and stirred for 1.5h. Methyl iodide (0.28 ml, 4.52 mmol) was added to the resultant mixture and the mixture stirred at rt for 1 h. The mixture was poured into ice Water (100 ml) and extracted with dichloromethane. The dichloromethane solution was washed with water (5×) and dried over magnesium sulfate. The solvent was evaporated in vacuo and the residue was crystallized from dichloromethane and hexanes to give the product 0.825 g (71%) as a colorless solid; mp 117°-118° C.; IR(KBr): 2979, 1677, 1572 and 1420 cm-1 ; MS: m/z 282 (MH+); 1H NMR (CDCl3): δ 1.27 (s,3 H), 1.48(s,3H), 2.05(m,2H), 2.50(m,2H), 3.33(m,2H), 3.41(d,J=8.8 Hz, 1H), 3.51(s,3H), 5.33(d,J=8.8 Hz, 1H), 6.55(d,J=5.4 Hz, 1H) and 7.09 (d,J=5.4 Hz, 1H).

1. stirringthe mixture stirred at rt for 1 h
2. extractionextracted with dichloromethane
3. washThe dichloromethane solution was washed with water (5×)
4. dry with materialdried over magnesium sulfate
5. customThe solvent was evaporated in vacuo
6. customthe residue was crystallized from dichloromethane and hexanes