O=[CH:2][CH2:3][CH:4]1[CH2:12][C:11]2[C:6](=[CH:7][C:8]([F:13])=[CH:9][CH:10]=2)[C:5]1=O.O.[NH2:16][CH2:17][C@H:18]([OH:20])[CH3:19]>C1(C)C=CC=CC=1.C1(C)C=CC(S(O)(=O)=O)=CC=1>[F:13][C:8]1[CH:7]=[C:6]2[C:11]([CH2:12][C:4]3[CH:3]=[CH:2][N:16]([CH2:17][C@H:18]([OH:20])[CH3:19])[C:5]=32)=[CH:10][CH:9]=1
A solution of 1.92 g of (RS)-2-(2-oxo-ethyl)-6-fluoro-1-indanone and 80 mg of p-toluenesulfonic acid in 90 ml of anhydrous toluene was heated on a water separator. A solution of 3.0 g of (R)-1-amino-2-propanol in 20 ml of anhydrous toluene was added dropwise to the boiling solution over a period of 5 minutes. Subsequently, the mixture was boiled for an additional 30 minutes, during which the solvent was reduced to a volume of 20 ml. The cooled reaction mixture was purified by column chromatography on silica gel (ethyl acetate/toluene 1:1). 1.73 g (75%) of (R)-1-(7-fluoro-1,4-dihydro-indeno[1,2-b]pyrrol-1-yl)-propan-2-ol were obtained as a brown oil which was used without further purification in the next reaction.
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