Preparation method of 2,3,4,6-tetra-oxo-benzyl-d-galactopyranose
A technology of galactopyranose and benzothiazolylthiotetrabenzyl half, applied in the field of preparation of 2,3,4,6-tetra-oxo-benzyl-D-galactopyranose, which can solve the cost High yield, low yield and other problems, to achieve the effect of simple operation, easy access to raw materials, saving operating costs and materials
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[0023] Example 1 5.5 : 2 : 1: 1.1
[0024] a) Add 5.5mol acetic anhydride and 2mol zinc chloride at room temperature, add 1mol galactose in 8 batches at 10-15°C, after the reaction is complete, add 1.1mol 2-mercaptobenzothiazole and heat to 50-60°C; Workup afforded 0.87 mol of benzothiazolylthioacetylgalactose.
[0025] b) Add 3.48 mol of potassium hydroxide and 0.87 mol of benzothiazolyl thioacetylgalactose to 8.7 mol of benzyl chloride and heat to reflux. After the reaction is completed, the temperature is lowered, and 0.79 mol of benzothiazolyl thiogalactose is obtained after post-treatment. Benzylgalactose.
[0026] c) Add 0.79 mol of benzothiazolylthiotetrabenzyl galactose to 4 mol of acetone to dissolve, add 2 mol of water, stir at room temperature, add 0.87 mol of N-bromosuccinimide, stir for 0.5 hours, and the reaction is completed After post-treatment, 0.71mol 2,3,4,6-tetra-oxo-benzyl-D-galactopyranose was obtained with a yield of 71%.
[0027] The post-treatment i...
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