2-Benzhydryl-3-quinuclidinone → (2S,3S)-2-benzhydrylquinuclidin-3-ol

Participants

Reaction Steps

398.0 mg (1.30 mmol) of a racemic mixture of 2-benzhydrylquinuclidin-3-one (1-2), 1.1 mg (1.3 μmol) of {[(S)-(6,6′-dimethyl-1,1′-biphenyl-2,2′-diyl)-bis(diphenylphosphine)]ruthenium (II) dichloride (DMF)n} complex, 6.4 ml of 2-propanol and 31 μl (1.55 μmol) of a 0.05 M 2-propanol solution of (2R,3R,4R,5R)-3,4-O-isopropylidenehexane-2,5-diamine were added to an autoclave in which the inside had been replaced with argon followed by degassing and stirring for 30 minutes at room temperature. 0.13 mL (0.13 mmol) of a 2-propanol solution of potassium tert-butoxide (1.0 M) were added thereto followed by stirring for 18 hours at 20 to 25° C. at a hydrogen pressure of 1 MPa. The same post-treatment procedure as Example 7 was carried out to obtain (2S,3S)-2-benzhydrylquinuclidin-3-ol (3-2) at a yield of 97% and optical purity of >99% ee.

Provenance & Evidence