Sodium borohydride → 7-chloro-1H-indole

反応式

[NH2:1][C:2]1[C:7]([Cl:8])=[CH:6][CH:5]=[CH:4][C:3]=1[C:9](=O)[CH2:10]Cl.[BH4-].[Na+]>O1CCOCC1.O>[Cl:8][C:7]1[CH:6]=[CH:5][CH:4]=[C:3]2[C:2]=1[NH:1][CH:10]=[CH:9]2

参加物

実験手順

Dissolve 1-(2-amino-3-chlorophenyl)-2-chloroethanone (7.0 g, 34.30 mmol) in 10% aqueous 1,4-dioxane (75 mL). Carefully add NaBH4 (2.6 g, 68.6 mmol, 2 eq.) as a solid. Heat to reflux. After 4 hours, cool to room temperature, dilute with water (300 mL), and extract with dichloromethane (2×200 mL). Combine the organic layers, dry over MgSO4, filter, and remove the solvent in vacuo leaving a light brown oil in the flask. Purify the oil by HPLC (silica gel mobile phase: 100% hexane to 50% EtOAc in hexanes over 50 minutes), to give the title compound as a brown oil: 1H NMR (300 MHz, d6-DMSO-d6): 5.16 (m, 1H), 5.39 (d, 1H), 5.70 (bs, 1H), 6.59 (t, 1H), 7.09 (m, 2H); MS (ES+): m/z 154, 152 (M+H)+.