C1C(=O)N([Br:8])C(=O)C1.[Br:9][C:10]1[CH:11]=[C:12]2[C:17](=[CH:18][CH:19]=1)[N:16]=[C:15]([C:20]([O:22]CC)=[CH2:21])[CH:14]=[CH:13]2>C1COCC1.O>[Br:8][CH2:22][C:20]([C:15]1[CH:14]=[CH:13][C:12]2[C:17](=[CH:18][CH:19]=[C:10]([Br:9])[CH:11]=2)[N:16]=1)=[O:21]NBS (407 mg, 2.287 mmol) was added to a solution of 6-bromo-2-(1-ethoxyvinyl)quinoline (530 mg, 1.91 mmol) in THF (10 mL) and water (2.5 mL) and the mixture was stirred at rt for 2 h. The reaction mixture was partitioned between EtOAc and brine and the organic layer was concentrated. The crude material was purified by flash silica gel chromatography (eluted with Et2O/hexanes, gradient from 0 to 5% Et2O) to yield 2-bromo-1-(6-bromoquinolin-2-yl)ethanone (380 mg) as white solid. LC-MS retention time 3.988 min; m/z 329.84 (MH+). LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a PHENOMENEX® Luna 3u C18 2.0×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 0.8 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 4 min, a hold time of 1 min, and an analysis time of 5 min where Solvent A was 10% MeOH/90% H2O/0.1% trifluoroacetic acid and Solvent B was 10% H2O/90% MeOH/0.1% trifluoroacetic acid. MS data was determined using a MICROMASS® Platform for LC in electrospray mode.
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