[Br:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]=[C:7](Cl)[CH:6]=[N:5]2.[C:13]1([C@H:19]([NH2:21])[CH3:20])[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.O>CS(C)=O>[Br:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]=[C:7]([NH:21][C@@H:19]([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[CH3:20])[CH:6]=[N:5]2To a solution of 6-Bromo-2-chloro-quinoxaline (0.45 g, 1 eq, 1.85 mmol) in DMSO (6 mL), was added (R)-1-phenylethanamine (0.67 g, 3 eq, 5.55 mmol) at room temperature. The mixture was stirred overnight. After completion of the reaction (confirmed by TLC), cold water (40 mL) was added to the reaction mixture and this was stirred for 1 hour at room temperature. The precipitate was filtered off, washed with water (10 mL) and then dried under vacuum to afford the title compound (0.48 g, 79%).
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