Formic Acid → 2-Chloro-1-(3-chloro-phenyl)-ethanol

Beteiligte Stoffe

Reaktionsschritte

2-Chloro-3′-chloroacetophenone (945.0 mg, 5.0 mmol), triethylamine (0.73 ml, 5.25 mmol), and formic acid (0.23 ml, 5.25 mmol) were added to an ethyl acetate (5.0 ml) solution containing chloro(pentamethylcyclopentadienyl)rhodium (III) (1R,2R)-N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine (1.35 mg, 0.002 mmol, s/c=5000) which was prepared in the same manner as described in Organic Letters, 1999, vol. 1, pp. 841-843, Supporting Information (see the above-described URL), and the mixture was stirred at room temperature for 2 hours. After completion of the reaction, 1 M hydrochloric acid (5.3 ml) was added, and the reaction product was extracted with ethyl acetate (5 ml) and dried over magnesium sulfate. Evaporation of the solvent yielded a desired compound, (+)-2-chloro-1-(3′-chlorophenyl)ethanol (891.5 mg; yield: 93.4%; optical purity: 93.8% ee).

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