- Synthesis method of monomethine cyanine dye
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The invention relates to a synthesis method of monomethine cyanine dye. The method comprises the following steps: (1) adding N-methyl quinoline-2-thioketone, methyl p-toluenesulfonate, active methyl-containing heterocyclic quaternary ammonium salt and absolute ethyl alcohol into a round-bottom flask; dropwise adding triethylamine; and performing reflux; and (2) performing reduced-pressure distillation on the solution after the reflux in the step (1) to separate out partial solvent, and cooling; and when solid is separated out, performing suction filtration, drying and recrystallizing to finally obtain a finished product of monomethine cyanine dye. The method provided by the invention has the advantages of easiness in operation, high synthesis yield, a few steps and short time, can effectively avoid the purifying treatment of the intermediate product, and realizes high synthesis efficiency and relatively low synthesis cost.
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Paragraph 0041-0045
(2018/02/04)
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- Efficient one-pot three-component synthesis of monomethine cyanine dyes with quinoline nucleus and their spectral properties
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An improved method for the preparation of monomethine cyanine dyes with quinoline nucleus by one-pot three-component using 1-methyl-2-quinolinethione, quaternized 2- or 4-methylheterocyclic compounds and methyl p-toluenesulfonate as starting materials was
- Fu,Zhang,Wang,Gao,Wang
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p. 489 - 494
(2013/08/25)
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