Method for preparing and purifying water-soluble cyanine dye (Cy5.5)
A purification method and technology of cyanine dyes, which are applied in the field of preparation and purification of water-soluble cyanine dyes Cy5.5, can solve problems such as separation difficulties, and achieve the effect of simple operation and low cost
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[0027] 1) Preparation of 1,1,2-trimethylbenzindole 1,3-disulfonate:
[0028] Add 6g of 6-naphthylhydrazine-1,3-disulfonic acid, 6.4mL of methyl isopropyl ketone, 5.88g of potassium acetate, and 30mL of acetic acid into a 100mL single-necked bottle, heat and reflux for 24 hours, and spin evaporate after cooling to obtain an earth-colored solid. Methanol was added for extraction, and the extract was concentrated by rotary evaporation to obtain a light yellow solid, which was 1,1,2-trimethylbenzindole 1,3-disulfonate.
[0029] 2) Preparation of N-ethyl-2,3,3-trimethylbenzindole 5,7-disulfonate:
[0030] Add 1g of 1,1,2-trimethylbenzindole 1,3-disulfonate, 3mL of iodoethane, 10mL of o-dichlorobenzene into a 25mL single-necked bottle, heat to 100°C for 24h and react after cooling , poured out o-dichlorobenzene, dissolved in methanol, and separated by preparative thin-layer chromatography to obtain a purple-red product.
[0031] 3) Preparation of N-(ε-carboxypentyl)-2,3,3-trimethy...
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