N-bromobutanimide → (1R,2S)-1-[(5-bromo-3,6-diethylpyrazin-2-yl)amino]-2,3-dihydro-1H-inden-2-ol

Beteiligte Stoffe

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Reaktionsschritte

A solution of (1R,2S)-1-[(3,6-diethylpyrazin-2-yl)amino]-2,3-dihydro-1H-inden-2-ol (1.94 g, 6.8 mmol) in dichloromethane (35 mL) was purged with nitrogen and cooled to 0° C. This light purple/grey homogenous solution was treated with a single portion of N-bromosuccinimide (1.34 g, 7.5 mmol) instantly becoming a lighter color. The reaction was warmed to room temperature for 15 minutes, transferred to a separatory funnel, diluted with 100 mL additional dichloromethane, washed twice with water (75 mL), and once with brine (75 mL). The organics were dried over MgSO4, filtered, and concentrated to give a golden oil. This material was purified by biotage MPLC (90 g column, 15% ethyl acetate/heptane) to afford 2.24 g (90%) of the title compound as a pale yellow solid. IR (diffuse reflectance) 3416, 3355, 2969, 2941, 1555, 1538, 1482, 1385, 1378, 1295, 1285, 1200, 1181, 1043, 733 cm−1; OAMS supporting ions at: ESI+ 361.9; MS (EI) m/z 361 (M+); [α]25D=−35 (c 0.53, methylene chloride); Anal. Calcd for C17H20BrN3O: C, 56.36; H, 5.56; N, 11.60. Found: C, 56.46; H, 5.59; N, 11.50.

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