3,4-dihydro-2H-pyran → (4S,5R)-4-(3,4-difluorophenyl)-5-(tetrahydropyran-2-yloxymethyl)-oxazolidin-2-one
Reaction equation
[F:1][C:2]1[CH:3]=[C:4]([C@H:9]2[C@H:13]([CH2:14][OH:15])[O:12][C:11](=[O:16])[NH:10]2)[CH:5]=[CH:6][C:7]=1[F:8].[O:17]1[CH:22]=[CH:21][CH2:20][CH2:19][CH2:18]1.C12(CS(O)(=O)=O)C(C)(C)C(CC1)CC2=O.C(OCC)(=O)C>ClCCl.CCCCCC>[F:1][C:2]1[CH:3]=[C:4]([C@H:9]2[C@H:13]([CH2:14][O:15][CH:18]3[CH2:19][CH2:20][CH2:21][CH2:22][O:17]3)[O:12][C:11](=[O:16])[NH:10]2)[CH:5]=[CH:6][C:7]=1[F:8]Participants
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Procedure
To a solution of (4S,5R) 4-(3,4-difluorophenyl)-5-hydroxymethyl-oxazolidin-2-one (695 mg, 3.0 mmol) in dry dichloromethane (30 mL) was added 2,3-dihydropyran (0.3 mL, 3.6 mmol) and camphorsulfonic acid (70 mg, 0.3 mmol). The reaction mixture was stirred at ambient temperature for 3 h. The reaction mixture was diluted with dichloromethane (100 mL), washed with saturated sodium bicarbonate solution (2×100 ml), brine (1×100 ml), dried over magnesium sulfate and filtered. The volatiles were removed under reduced pressure and the resulting solid was purified by pressurized silica gel chromatography (1:1 then 2:1 ethyl acetate:hexane) to afford (4S,5R)-4-(3,4-difluorophenyl)-5-(tetrahydropyran-2-yloxymethyl)-oxazolidin-2-one as a colorless oil (750 mg, 2.4 mmol, 80%).
Workup
- washwashed with saturated sodium bicarbonate solution (2×100 ml), brine (1×100 ml)
- dry with materialdried over magnesium sulfate
- filtrationfiltered
- customThe volatiles were removed under reduced pressure
- customthe resulting solid was purified by pressurized silica gel chromatography (1:1
Sources & evidence
- ORD record
- ord-026a614becc4480eaf06142c0f4882e8
- Source dataset
- uspto-grants-2000_11
- Patent number
- US06143750
Reaction notes
Loading…