Method for preparing isopropyl-beta-D-thiogalactoside
A technology of thiogalactoside and propylthioacetyl, which is applied in the field of preparation of isopropyl-β-D-thiogalactoside, which achieves the effect of simple operation, easy availability of raw materials, and improved safety factor
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Embodiment 1
[0025] The post-treatment in step a is to dropwise add 10 mol of water at 0-5°C and stir for 2 hours, extract the aqueous layer with 5 mol of dichloromethane, separate the organic phase and wash the organic phase with 10 mol of water three times, separate the organic phase and concentrate, add 1mol tert-butyl methyl ether and 2mol isohexane mixed solution crystallized, filtered and dried.
[0026] The post-treatment in step b is to concentrate to dryness, add 0.2 mol ethanol and 1.8 mol tert-butyl methyl ether for crystallization, filter and dry.
[0027] Example 2 5.5 : 1.5 : 1: 1.2
[0028] a) Add 5.5 mol of acetic anhydride and 1.5 mol of aluminum trichloride at room temperature, add 1 mol of galactose in 12 batches at 5-10 °C, after the reaction is completed, add 1.2 mol of isopropyl mercaptan, after the reaction is completed, 0.771 mol is obtained after post-treatment Isopropylthioacetylgalactose;
[0029] b) Add 0.771 mol of isopropylthioacetylgalactose to 10 mol of me...
Embodiment 2
[0030] The post-treatment in step a is to dropwise add 10 mol of water at 0-5°C and stir for 2 hours, extract the aqueous layer with 5 mol of dichloromethane, separate the organic phase and wash the organic phase with 10 mol of water three times, separate the organic phase and concentrate, add 1mol tert-butyl methyl ether and 2mol isohexane mixed solution crystallized, filtered and dried.
[0031] The post-treatment in step b is to concentrate to dryness, add 0.2 mol ethanol and 1.8 mol tert-butyl methyl ether for crystallization, filter and dry.
[0032] Example 3 6:1.5: 1: 1.2
[0033] a) Add 6 mol of acetic anhydride and 1.5 mol of aluminum trichloride at room temperature, add 1 mol of galactose in 12 batches at 5-10°C, add 1.3 mol of isopropyl mercaptan after the reaction is completed, and obtain 0.774 mol of isopropyl mercaptan after the reaction is completed Propylthioacetylgalactose;
[0034] b) Add 0.774 mol of isopropylthioacetylgalactose to 10 mol of methanol to di...
Embodiment 3
[0035] The post-treatment in step a is to dropwise add 10 mol of water at 0-5°C and stir for 2 hours, extract the aqueous layer with 5 mol of dichloromethane, separate the organic phase and wash the organic phase with 10 mol of water three times, separate the organic phase and concentrate, add 1mol tert-butyl methyl ether and 2mol isohexane mixed solution crystallized, filtered and dried.
[0036] The post-treatment in step b is to concentrate to dryness, add 0.2 mol ethanol and 1.8 mol tert-butyl methyl ether for crystallization, filter and dry.
[0037] Example 4 6 : 1 : 1: 1.1
[0038] a) Add 6mol acetic anhydride and 1mol zinc chloride at room temperature, add 1mol galactose in 12 batches at 5-10°C, add 1.1mol isopropyl mercaptan after the reaction is completed, and obtain 0.732mol isopropyl after the reaction is completed Thioacetylgalactose;
[0039] b) Add 0.732 mol of isopropylthioacetylgalactose to 10 mol of methanol to dissolve, add 0.01 mol of sodium methoxide, ad...
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