1,3-Diphenyl-2-propanone → (1R)-1,3-diphenyl-1-propanol
Reaction equation
[C:1]1([CH2:7][C:8](=O)[CH2:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.B(Cl)([C@@H]1[C@@H](C)[C@H]2C(C)(C)[C@H](C2)C1)[C@@H]1[C@@H](C)[C@H]2C(C)(C)[C@H](C2)C1.[O:39]1CCCC1>>[C:1]1([C@H:7]([OH:39])[CH2:8][CH2:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1Participants
4
Procedure
A solution of 1,3-diphenylpropanone (1.07 g; 5.09 mmol) in tetrahydrofuran (10 mL) was cooled to −230 C. and treated with an asymmetric reducing agent, (+)-B-chlorodiisopinocampheyl-borane (1.80 g; 5.60 mmol) in 20 mLTHF, and the resulting solution was allowed to stand overnight at −230 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 concentrated, 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)-1,3diphenyl-1-propanol as a crystalline white solid, 1H NMR (360 Mhz; CDCl3): d 1.95-2.15 (m, 3H); 2.59-2.78 (m, 2H); 4.65 (dd, 1H, 1=5.4, 7.8); 7.14-7.35 (m, IOH).