Tetrahydrofuran → 1,2,3,4-Tetrahydro-2-naphthalenol

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In situ Preparation of the Compound of Formula (II) wherein R1 is ##STR10## Borane methylsulfide complex (neat, ~10M, 1.4 mL, 14 mmol) was added to a solution of cis, exo-3-amino-2-hydroxybornane [J. Chem. Soc. (C) 49 1970] (169 mg, 1 mmol) in THF (70 mL) at ambient temperature and stirred for 16 hrs. α-Tetralone (2.92 g, 19.7 mmol) as a solution in THF (10 mL) was added to the preceding solution over 1 hr, stirred for 15 min after addition was completed, cooled to 0° C., and quenched with methanol (27 mL). After stirring the quenched reaction for 18 hrs, the solvents were removed under vacuum, the residual oil was dissolved in methylene chloride (60 mL), and washed with pH 4 phosphate buffer (50 mL), water (50 mL), treated with magnesium sulfate, and the solvent was removed under vacuum to give the (R) tetralol 2.89 g (97% yield) 84% ee.

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