[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:13]([CH3:14])=[N:12][N:11]([CH3:15])[C:10](=[O:16])[CH:9]=2)=[CH:4][CH:3]=1.C([O-])([O-])=O.[K+].[K+].Br[CH2:24][CH2:25][CH2:26][Cl:27]>CC(C)=O>[Cl:27][CH2:26][CH2:25][CH2:24][O:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:13]([CH3:14])=[N:12][N:11]([CH3:15])[C:10](=[O:16])[CH:9]=2)=[CH:4][CH:3]=1A solution of the product from step 2 (710 mg, 3.29 mmol), K2CO3 (1.36 g, 3.0 eq.) and 3-bromo-1-chloropropane (0.39 mL, 1.2 eq.) in CH3COCH3 (30 mL) was heated to 80° C. overnight. The mixture was then filtered, washed with acetone and concentrated to dryness to afford the product of step 3 (950 mg, 98%): MS m/z 293 (M+H).
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