Method for preparing (2S)-2-[[(9H-fluorene-9-yl methoxy) carbonyl] amino]-3-(2,2-dimethyl-1,3-benzo dioxol-5-yl)propionate
A technology of benzodioxol and methoxy, which is applied in the direction of organic chemistry, can solve the problems of many steps in the synthesis route and difficult operation, and achieve the effect of simple operation, relaxed reaction conditions, and easy operation
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Embodiment 1
[0011] Mix levodopa and sodium bicarbonate at a molar ratio of 1:4, add water and stir, add acetone and stir, add fluorenylmethoxycarbonyl succinimide with a molar ratio of levodopa of 1:0.95, stir overnight, and remove by rotary evaporation Wash the water layer with acetone and ether, add ethyl acetate, adjust the pH to 4, separate, extract, wash the ethyl acetate layer with water, dry, concentrate, add petroleum ether to crystallize, filter, and dry to obtain fluorenyl moxycarbonyl bar.
[0012] The reaction of fluorenylmethoxycarbonyl levodopa with 2,2-dimethoxypropane generates (2S)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-3-(2, The operation steps of 2-dimethyl-1,3-benzodioxol-5-yl)propionic acid are as follows, fluorenylmethoxycarbonyl levodopa is dissolved in tetrahydrofuran, and the molar ratio of 1:10 is added to 2 , 2-dimethoxypropane, add pyridinium p-toluenesulfonate with a molar ratio of 1:0.2, reflux for 8 hours, concentrate THF after reaction, add ethyl ace...
Embodiment 2
[0015] Mix 1 mol of levodopa, 5 mol of sodium bicarbonate, and solids evenly, add 3 liters of water and stir, add 2.5 liters of acetone, stir, slowly add 0.95 mol of fluorenyl moxycarbonyl succinimide, stir overnight, rotary steam, remove acetone, A large amount of viscous solids precipitated. Add 1 liter of diethyl ether, stir vigorously for 5 minutes, and separate the liquids. Add 2 liters of ethyl acetate to the water layer, stir, and adjust the pH value of the water layer to 3 with 3 equivalents of hydrochloric acid. The system is clarified, and the liquids are separated. The aqueous layer was extracted once more with 1 liter of ethyl acetate, the ethyl acetate layers were combined, washed once with 1 N hydrochloric acid, once with water, twice with saturated brine, dried over anhydrous sodium sulfate, and filtered to remove Sodium sulfate water, concentrated ethyl acetate layer, washed the solid with petroleum ether, filtered off the solid, and dried to obtain 0.9 mol o...
Embodiment 3
[0018] Mix 1 mol of levodopa, 4 mol of sodium bicarbonate, and solids evenly, add 3 liters of water and stir, add 2.5 liters of acetone, stir, slowly add 0.9 mol of fluorenyl moxycarbonyl succinimide, stir overnight, rotary steam, remove acetone, A large amount of viscous solids precipitated. Add 1 liter of diethyl ether, stir vigorously for 5 minutes, and separate the liquids. Add 2 liters of ethyl acetate to the water layer, stir, and adjust the pH value of the water layer to 3 with 3 equivalents of hydrochloric acid. The system is clarified, and the liquids are separated. The aqueous layer was extracted once more with 1 liter of ethyl acetate, the ethyl acetate layers were combined, washed once with 1 N hydrochloric acid, once with water, twice with saturated brine, dried over anhydrous sodium sulfate, and filtered to remove Sodium sulfate water, concentrate the ethyl acetate layer, wash the solid with petroleum ether, filter out the solid, and dry to obtain 0.85mol of the...
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