[H-].[Na+].[CH3:3][C:4]1[NH:5][C:6]2[C:11]([CH:12]=1)=[CH:10][C:9]([CH3:13])=[CH:8][CH:7]=2.Br[CH2:15][C:16]([O:18]CC)=[O:17].[OH-].[Na+].Cl>CN(C=O)C.CCO>[CH3:3][C:4]1[N:5]([CH2:15][C:16]([OH:18])=[O:17])[C:6]2[C:11]([CH:12]=1)=[CH:10][C:9]([CH3:13])=[CH:8][CH:7]=260% sodium hydride/oil (0.64 g) was added to a solution of 2,5-dimethyl-1H-indole (2.0 g) in DMF (15 ml). After 15 min ethyl bromoacetate (2.7 ml) was added quickly and the reaction stirred for 20 min. The mixture was quenched with 1% aqueous acetic acid (100 ml), extracted with ethyl acetate (2×100 ml) and washed with water (2×50 ml) and brine (20 ml). The extracts were dried (MgSO4), filtered and evaporated in vacuo to yield a brown solid. The solid was dissolved in EtOH (20 ml) and aqueous sodium hydroxide (1M,10 ml) added. After 1 h the solution was adjusted to pH6 with aqueous hydrochloric acid (1M,˜10 ml), and then evaporated in vacuo. The residue was purified by flash column chromatography (gradient 1-10% methanol in dichloromethane). The sub-title compound was obtained as a red/brown solid (1.3 g).
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