[CH3:1][N:2]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[CH:9]([C:16]([OH:18])=O)[C:8]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]1=2.S(Cl)([Cl:21])=O.C1C(N=NC2C=CC(N)=C(S([O-])(=O)=O)C=2)=CC=C(S([O-])(=O)=O)C=1.[Na+].[Na+]>ClCCl>[CH3:1][N:2]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[CH:9]([C:16]([Cl:21])=[O:18])[C:8]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]1=2Into a 50 mL round bottom flask equipped with magnetic stirrer and under an argon atmosphere was charged a solution of 0.305 parts of 10-methylacridan-9-carboxylic acid (77) in 15 mL of dichloromethane and cooled to 5° C. (ice-water). Then, 1.05 parts of thionyl chloride was added to the cold yellow acid solution and stirred for 1.5 hr at a temperature below 15° C. The light red brown solution was concentrated under reduced pressure and the residue was dried for 15 min to give acid chloride (78).
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