O=[CH:2][CH2:3][CH:4]1[CH2:12][C:11]2[C:6](=[CH:7][C:8]([F:14])=[C:9]([F:13])[CH:10]=2)[C:5]1=O.C1(C)C=CC(S(O)(=O)=O)=CC=1.O.[NH2:28][CH2:29][C@H:30]([OH:32])[CH3:31]>C1(C)C=CC=CC=1>[F:13][C:9]1[CH:10]=[C:11]2[C:6](=[CH:7][C:8]=1[F:14])[C:5]1[N:28]([CH2:29][C@H:30]([OH:32])[CH3:31])[CH:2]=[CH:3][C:4]=1[CH2:12]2A solution of 2.1 g of (RS)-2-(2-oxoethyl)-5,6-difluoro-1-indanone and 80 mg of p-toluenesulfonic acid in 70 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 45 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 (diethyl ether/hexane 7:3). 1.13 g (45%) of (R)-1-(6,7-difluoro-1,4-dihydro-indeno[1,2-b]pyrrol-1-yl)-propan-2-ol were obtained as a brown solid which was used without further recrystallization in the next reaction.
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