Water → (R)-1-[7'-methoxy-1',4'-dihydro-spiro[cyclopentane-1,4'-indeno[1,2-b]pyrrole]-1'-yl]-propan-2-ol

Participants

Reaction Steps

A solution of 2.58 g of (RS)-2'-(2-oxoethyl)-5'-methoxy-2',3'-dihydro-spiro[cyclopentane-1,1'-[1H]indene]-3'-one 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 (ethyl acetate/hexane 1:1). 1.98 g (67%) of (R)-1-[7'-methoxy-1',4'-dihydro-spiro[cyclopentane-1,4'-indeno[1,2-b]pyrrole]-1'-yl]-propan-2-ol were obtained as a yellow oil.

Provenance & Evidence