[CH:1]1([CH2:4][N:5]2[C:9](=[O:10])[C:8]3=[CH:11][CH:12]=[CH:13][CH:14]=[C:7]3[C:6]2=[O:15])[CH2:3][CH2:2]1>CO.[BH4-].[K+].ClCCl>[OH:10][CH:9]1[C:8]2[C:7](=[CH:14][CH:13]=[CH:12][CH:11]=2)[C:6](=[O:15])[N:5]1[CH2:4][CH:1]1[CH2:2][CH2:3]13-Hydroxy-2-cyclopropylmethyl-2,3-dihydroisoindol-1-one is prepared as described in Example 1, starting with 4.3 g of N-cyclopropylmethylphthalimide in 40 cm3 of methanol and 1.2 g of potassium borohydride. The reaction mixture is stirred at a temperature in the region of 20° C. for 20 hours and is then cooled to a temperature in the region of 0° C. and distilled water is added dropwise. The precipitate obtained is filtered off and the solid obtained is then taken up in dichloromethane and concentrated to dryness under reduced pressure (2 kPa) at a temperature in the region of 40° C. 4.1 g of 3-hydroxy-2-cyclopropylmethyl-2,3-dihydroisoindol-1-one are thus obtained in the form of a white powder (Rf=0.38, thin layer chromatography on silica gel, eluent: cyclohexane/ethyl acetate (50/50 by volume)).
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