[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:11])[N:3]1[C@@H:12]([CH2:21][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)[C@H:13]([OH:20])[CH2:14]OS(C)(=O)=O.[Cl-].[Na+].S(=O)(=O)(O)O>O1CCCC1>[C:22]1([CH2:21][C@@H:12]([C@H:13]2[CH2:14][O:20]2)[N:3]2[C:4](=[O:11])[C:5]3=[CH:6][CH:7]=[CH:8][CH:9]=[C:10]3[C:2]2=[O:1])[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1A solution of 0.26 g of methanesulfonic acid (2S,3S)-3-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)-2-hydroxy-4-phenylbutyl ester in 1.6 ml of tetrahydrofuran is treated at -15° with a solution of 0.090 g of potassium tert.butylate in 0.5 ml of tetrahydrofuran and the mixture is stirred for 0.5 hours. The mixture is treated with 2.2 ml of semi-saturated sodium chloride solution and the pH value is adjusted to 6 with 0.1 ml of 1N sulphuric acid. Thereafter, the mixture is extracted with ethyl acetate. The extracts are dried and filtered, and the filtrate is evaporated to give 0.12 g (60%) of 2(S)-[2-phenyl-1(S)-phthalimidoethyl]oxirane, IR (KBr): 1773 m and 1709 s (C=O of imide).
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