Anti-diabetes oral pharmaceutical composition
An anti-diabetic and composition technology, which is applied in the field of anti-diabetic oral pharmaceutical composition, can solve problems such as rising drug costs, increased treatment costs, and health damage
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[0018] I. 5-(3-Hydroxy-7-propoxynaphthalen-2-yl)-1,1-dioxo-[1,2,5]thiadiazolidin-3-one potassium salt
[0019]
[0020] step 1
[0021] 3-Hydroxy-7-propoxynaphthalene-2-propyl carboxylate
[0022] To a suspension of 1.6 g (29.6 mmol) sodium methoxide in DMA (30 mL) was added 3.0 g (14.7 mmol) 3,7-dihydroxynaphthalene-2-carboxylic acid. The mixture was stirred at room temperature for 1 hour, then 5.05 g (29.7 mmol) of propyl iodide were added and stirring was continued for 48 hours. The mixture was poured into water and acidified with 2N HCl. The mixture was extracted with ethyl acetate and the organic phase was washed with water (3x) and brine (1x). The solution was dried over sodium sulfate and the solvent was removed under reduced pressure. The residual oil was purified by flash chromatography with dichloromethane, eluting the title compound, which was isolated as a yellow oil. MS (M-1): 287.
[0023] step 2
[0024] 3-Benzyloxy-7-propoxynaphthalene-2-propyl carbox...
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