反应详情

温度

50 °C

A suspension of 7-methoxy-2′,3′,5′,6′-tetrahydro-spiro[1,3-benzodioxole-2,4′-(4H)-thiopyran]-4-carboxylic acid (570 mg, 2.02 mmol), K2CO3 (558 mg, 4.04 mmol) and dimethyl sulphate (0.25 mL, 2.62 mmol) in acetone (14 mL) was stirred at 50° C. overnight. At room temperature water (30 mL) was added. The aqueous phase was extracted with dichloromethane (3×15 mL). The combined organic phase was dried over MgSO4 and evaporated to dryness under reduced pressure. Standard silica gel column chromatography afforded methyl 7-methoxy-2′,3′,5′,6′-tetrahydro-spiro[1,3-benzodioxole-2,4′-(4H)-thiopyran]-4-carboxylate (407 mg, 68%). 13C NMR (DMSO) δ 163.8, 148.1, 146.9, 134.6, 123.4, 118.3, 107.1, 105.9, 56.1, 51.6, 35.9, 25.4.

1. extractionThe aqueous phase was extracted with dichloromethane (3×15 mL)
2. dry with materialThe combined organic phase was dried over MgSO4
3. customevaporated to dryness under reduced pressure