Method for catalytic synthesis of salidroside
A salidroside and synthetic method technology, applied in chemical instruments and methods, organic chemistry, bulk chemical production, etc., can solve the problems of low yield and high production cost, and achieve high product yield, low cost, and catalytic The effect of improving efficiency
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Embodiment 1
[0044] (1) Synthesis of intermediate 4-benzyloxyphenethyl alcohol:
[0045] Dissolve 600g (4.348mol) of 4-hydroxyphenethyl alcohol in 1 liter of DMF. After dissolving, add 178g (4.45mol) of sodium hydroxide and stir for half an hour. Then add 481g (4.829mol) of benzyl chloride. TLC monitors that there is no raw material benzyl chloride. For post-treatment, it was directly poured into ice water, stirred for half an hour, filtered, washed with water, and dried to obtain 842 g of white solid, with a yield of 85%.
[0046] (2) Preparation of 2-(4-benzyloxyphenyl)ethyl-(2,3,4,6-O-tetra-acetyl)-β-D-glucopyranoside:
[0047] Add 273g (0.70mol) of peracetyl glucose, 191.5g (0.84mol) of 4-benzyloxy phenethyl alcohol, 29g (0.21mol) of zinc chloride and 13.6g (0.14mol) of magnesium chloride directly into 1.5L of chloroform Stir, react at 60°C for 10 hours and then desolvate to obtain off-white solid 2-(4-benzyloxyphenyl)ethyl-(2,3,4,6-O-tetra-acetyl)-β-D-pyran Glucoside 289g (0.51mol), the yi...
Embodiment 2
[0065] The preparation of 2-(4-benzyloxyphenyl) ethyl-(2,3,4,6-O-tetra-acetyl)-β-D-glucopyranoside: 200g (0.513 mol), 196g (0.86mol) of 4-benzyloxy phenethyl alcohol, 129g (0.97mol) of aluminum trichloride, 50g (0.513mol) of magnesium chloride, directly added to 1.2L of chloroform and stirred, reacted at 60℃ for 10h, and then dissolved , To obtain 200 g (0.36 mol) of off-white solid, with a yield of 70%.
Embodiment 3
[0067] Preparation of 2-(4-benzyloxyphenyl) ethyl-(2,3,4,6-O-tetra-acetyl)-β-D-glucopyranoside: 279 g (0.717 mol), 196g (0.86mol) of 4-benzyloxyphenethyl alcohol, 186g (0.717mol) of tin chloride and 44g (0.717mol) of magnesium fluoride are directly added to 1.6L of dichloroethane and stirred, and reacted at 60°C for 15h After desolvation, 281 g (0.49 mol) of off-white solid was obtained with a yield of 68%.
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