Synthetic method of D-cycloserine intermediate
A technology of serine methyl ester and alanine methyl ester, which is applied in the field of medicine, can solve the problems of high price of thionyl bromide, hidden safety hazards, and low atom economy, so as to improve operational safety, facilitate industrial scale-up, and collect The effect of high rate and purity
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Embodiment 1
[0025] In a 1L four-neck flask, add 150ml of acetonitrile and 450ml of dichloromethane, weigh 60g of D-serine methyl ester hydrochloride (0.386mol) into the mixed solvent, stir evenly, cool to 0℃, and then slowly add SOCl 2 34.4ml (0.463mol), keep the temperature at 0℃, add SOCl 2 Then the temperature was raised to 30°C. After 12 hours of reaction, 61.4 g of white solid (purity 96.8%) was obtained by filtration, and the product yield was 88.5%.
Embodiment 2
[0027] In a 1L four-neck flask, add 200ml of acetonitrile and 400ml of dichloromethane, weigh 60g of D-serine methyl ester hydrochloride (0.386mol) into the mixed solvent, stir evenly, cool to 0°C, and then slowly add SOCl 2 34.4ml (0.463mol), keep the temperature at 0℃, add SOCl 2 Then the temperature was raised to 30°C. After 12 hours of reaction, 63.4 g of white solid (purity 97%) was obtained by filtration, with a yield of 91.6%.
Embodiment 3
[0029] In a 1L four-neck flask, add 300ml of acetonitrile and 300ml of dichloromethane, weigh 60g of D-serine methyl ester hydrochloride (0.386mol) into the mixed solvent, stir well, cool to 0°C, and then slowly add SOCl 2 34.4ml (0.463mol), keep the temperature at 0℃, add SOCl 2 Then the temperature was raised to 20°C. After 12 hours of reaction, 64.92 g of white solid (purity 97%) was obtained by filtration, and the yield was 93.8%.
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