1,3-Diphenyl-2-propanone → (1R)-1,3-diphenyl-1-propanol

Participants

Reaction Steps

A solution of 1,3-diphenylpropanone (1.07 g; 5.09 mmol) in tetrahydrofuran (10 mL) was cooled to −23° C. and treated with an asymmetric reducing agent, (+)-B-chlorodiisopinocampheyl-borane (1.80 g; 5.60 mmol) in 20 mL THF, and the resulting solution was allowed to stand overnight at −23° C. After evaporating to dryness, the residue was treated with ether (65 mL) and diethanolamine (1.0 g) and stirred for 3 hrs. The mixture was then filtered to remove solids and concetrated, and the residue was purified using gradient elution (5% ethyl acetate/hexane to 10% ethyl acetate) on a silica gel column to obtain 660 mg (61%) of (1R)-1,3-diphenyl-1-propanol as a crystalline white solid, 1H NMR (360 Mhz; CDCl3): δ 1.95–2.15 (m, 3H); 2.59–2.78 (m, 2H); 4.65 (dd, 1H, J=5.4, 7.8); 7.14–7.35 (m, 10H).

Provenance & Evidence