Synthesis method of spiropyrane small-molecule fluorescent probe with extreme acid/extreme alkaline switch response and application of spiropyrane small-molecule fluorescent probe
A technology of fluorescent probes and spiropyrans, applied in the field of molecular fluorescent probes, to achieve the effects of fast pH response, excellent biocompatibility, and good biocompatibility
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[0029] 1) Slowly add 43.3mmol of phosphorus oxychloride dropwise to 1.5mL of dimethylformamide in an ice bath, remove the ice bath, stir at room temperature for 30 minutes under a nitrogen atmosphere, then drop in 10mL of 2,7-dimethoxy The dichloromethane solution of dimethoxynaphthalene, in which 2,7-dimethoxynaphthalene is 5.3mmol, reacted at room temperature for 10h; after the reaction was completed, the reaction liquid was added dropwise into the ice-water mixture, hydrolyzed for 3h, extracted with dichloromethane, and then The solvent dichloromethane was evaporated to dryness, and finally recrystallized with methanol to obtain white needle-like crystals of 2,7-dimethoxy-1-aldehyde naphthalene, denoted as AO, with a yield of 78%;
[0030] 1 H NMR (CDCl 3,400MHz,ppm):δ10.90(s,1H,CHO),8.85(d,1H,ArH),7.98(d,1H,ArH),7.66(d,1H,ArH),7.12(d,1H, ArH),7.07(dd,1H,ArH),4.08(s,3H,OCH 3 ),3.98(s,3H,OCH 3 ). 13 C NMR (101MHz, CDCl 3 ): δ192.07, 164.86, 161.52, 137.37, 133.52, 129....
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