反应详情

温度

-70 °C

To a solution of distilled diisopropylamine (16.2 ml, 0.116 mol) in distilled tetrahydrofuran (115 ml), cooled at -10° C., under a nitrogen atmosphere, was added 1.56M butyl lithium in hexane (75.3 ml, 0.117 mol). After 15 minutes, the solution was cooled to -70° C. and there was added dropwise a solution of furo[3,2-c]pyridine (11.74 g, 0.0987 mol) in tetrahydrofuran (70 ml). With vigorous stirring the gummy precipitate formed a salmon-colored powder. After one hour, sulfur dioxide gas was bubbled over the surface with gradual warming to room temperature. The suspension was diluted with diethyl ether (200 ml) and the precipitate was collected by filtration. This crude lithium sulfinate intermediate (29.1 g) was dissolved in water (200 ml) and sodium acetate trihydrate (61 g, 0.45 mol) and hydroxylamine-O-sulfonic acid (18 g, 0.16 mol) were added. The solution was stirred for 18 hours as the product slowly precipitated. The precipitated product was collected by filtration and redissolved in ethyl acetate/methanol, dried over anhydrous sodium sulfate, filtered through a pad of charcoal and evaporated to give white crystalline product (8.0 g, 41% yield). This material was recrystallized from ethyl acetate/methanol to give 6.7 g, m.p. 216°-218° C.

1. customformed a salmon-colored powder
2. waitAfter one hour
3. customsulfur dioxide gas was bubbled over the surface
4. temperaturewith gradual warming to room temperature
5. additionThe suspension was diluted with diethyl ether (200 ml)
6. filtrationthe precipitate was collected by filtration
7. dissolutionThis crude lithium sulfinate intermediate (29.1 g) was dissolved in water (200 ml)
8. stirringThe solution was stirred for 18 hours as the product
9. customslowly precipitated
10. filtrationThe precipitated product was collected by filtration
11. dissolutionredissolved in ethyl acetate/methanol
12. dry with materialdried over anhydrous sodium sulfate
13. filtrationfiltered through a pad of charcoal
14. customevaporated