Sulfuric Acid → (1R,2S)-(+)-cis-1-Amino-2-indanol

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Into a 100 ml four-neck flask, 4.48 g (30.3 mmol) of trans-(±)-1,2-indandiol (II) and 40 ml of acetonitrile were introduced. This mixture was suspended. While this suspension was stirred at room temperature, 6.14 g (60.6 mmol) of 97% sulfuric acid was added thereto at room temperature in a period of 20 minutes. The temperature within the mixture increased from 19° C. to 35° C. The slurry was completely dissolved to form a slightly yellow transparent solution. The solution was stirred at 24° C. for 1 hour and then at 60° C. for 1 hour. An HPLC analysis of the contents revealed that 70.8% of cis-oxazoline derivative (IV: R=CH3) had been generated, while no trans-amide derivative (III': R=CH3, Y=OH) was detected. Then, 30 ml of water was added thereto and the resulting mixture was stirred at 60° C. for 3 hours. Acetonitrile was removed by azeotropic distillation. The remaining mixture was washed with dichloromethane and then subjected to liquid separation. When an aqueous solution of 25% sodium hydroxide was added to the water phase, a crystal deposited. This crystal was filtered off under reduced pressure, washed with water, and then dried to yield 2.70 g (yield: 59.7%) of cis-(±)-1-aminoindan-2-ol (V) as a white crystal. Its purity determined by an HPLC was 97.7%.

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