[CH3:1][O:2][C:3]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:4]=1[CH2:5][CH2:6][CH:7]([C:14]([O:16][CH3:17])=[O:15])[C:8]2=[O:13].CC1(C)C2(CS(O)(=O)=O)C(CC1CC2)=O.C(OCC)(=O)C>CO>[OH:13][C@H:8]1[C:9]2[C:4](=[C:3]([O:2][CH3:1])[CH:12]=[CH:11][CH:10]=2)[CH2:5][CH2:6][C@@H:7]1[C:14]([O:16][CH3:17])=[O:15]A solution of methyl [5-methoxy-1-oxo-1,2,3,4-tetrahydro-2-naphthyl]formate (2.50 g), D-10-camphorsulfonic acid (124 mg), [RuCl2 (S)-binap]2NEt3 (90 mg) [cf. Tetrahedron Letters, Vol. 35, No. 26,pp 4559-4562, 1994], ethyl acetate (23.8 ml) and methanol (1.25 ml) was stirred under hydrogen (90 atm) at 50° C. for 40 hours. The reaction mixture was evaporated in vacuo and the residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=4:1) to give (1R,2S)-methyl [1-hydroxy-5-methoxy-1,2,3,4-tetrahydro-2-naphthyl]formate (2.47 g) as a white powder.
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