[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:11]=1[N:10]=[C:9]([CH:12]([OH:15])[CH2:13][OH:14])[CH:8]=[CH:7]2.CO[C:18](OC)([CH3:20])[CH3:19].O.[O-2].[O-2].[O-2].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.[Al+3].[Al+3]>CC(C)=O>[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:11]=1[N:10]=[C:9]([CH:12]1[CH2:13][O:14][C:18]([CH3:20])([CH3:19])[O:15]1)[CH:8]=[CH:7]2To 1-(8-bromoquinolin-2-yl)ethane-1,2-diol (505 mg, 1.88 mmol) in acetone (5 mL) and 2,2-dimethoxypropane (5 mL, 1.88 mmol) was added Montmorillonite K 10 (1 g). The reaction mixture was stirred for 2 hours, then filtered and concentrated to give crude product.
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