O=[CH:2][CH2:3][CH:4]1[CH2:12][C:11]2[C:6](=[CH:7][C:8]([C:13]([O:15][CH3:16])=[O:14])=[CH:9][CH:10]=2)[C:5]1=O.O.[NH2:19][CH2:20][CH:21]([OH:23])[CH3:22]>C1(C)C=CC=CC=1.C1(C)C=CC(S(O)(=O)=O)=CC=1>[CH3:16][O:15][C:13]([C:8]1[CH:7]=[C:6]2[C:11]([CH2:12][C:4]3[CH:3]=[CH:2][N:19]([CH2:20][CH:21]([OH:23])[CH3:22])[C:5]=32)=[CH:10][CH:9]=1)=[O:14]A solution of 2.32 g of (RS)-2-(2-oxoethyl)-6-methoxycarbonyl-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 g of (RS)-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 (ethyl acetate/toluene 1:1). 2.2 g (81%) of (RS)-1-(7-methoxycarbonyl-1,4-dihydro-indeno[1,2-b]pyrrol-1-yl)-propan-2-ol were obtained as a brown oil.
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