Carbon tetrabromide → (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(bromomethyl)-5-(trifluoromethyl)benzyl]-4-methyl-1,3-oxazolidin-2-one

HRID 505259Notes

Reaction equation

HRID 505259 reaction equation
[F:1][C:2]([F:34])([F:33])[C:3]1[CH:4]=[C:5]([C@H:13]2[O:17][C:16](=[O:18])[N:15]([CH2:19][C:20]3[CH:25]=[C:24]([C:26]([F:29])([F:28])[F:27])[CH:23]=[CH:22][C:21]=3[CH2:30]O)[C@H:14]2[CH3:32])[CH:6]=[C:7]([C:9]([F:12])([F:11])[F:10])[CH:8]=1.C(Br)(Br)(Br)[Br:36].C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>C(Cl)Cl>[F:1][C:2]([F:34])([F:33])[C:3]1[CH:4]=[C:5]([C@H:13]2[O:17][C:16](=[O:18])[N:15]([CH2:19][C:20]3[CH:25]=[C:24]([C:26]([F:29])([F:28])[F:27])[CH:23]=[CH:22][C:21]=3[CH2:30][Br:36])[C@H:14]2[CH3:32])[CH:6]=[C:7]([C:9]([F:12])([F:11])[F:10])[CH:8]=1

Participants

5

Reactant 3

HCID 11205Carbon tetrabromideHCID 11776TriphenylphosphineHCID 86628752(4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(hydroxymethyl)-5-(trifluoromethyl)benzyl]-4-methyl-1,3-oxazolidin-2-one

Product 1

HCID 57617862(4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(bromomethyl)-5-(trifluoromethyl)benzyl]-4-methyl-1,3-oxazolidin-2-one

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a 0° C. solution of (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(hydroxymethyl)-5-(trifluoromethyl)benzyl]-4-methyl-1,3-oxazolidin-2-one (210 mg, 0.419 mmol) in CH2Cl2 (4 mL) was added CBr4 (292 mg, 0.880 mmol) and a solution of PPh3 (220 mg, 0.838 mmol) in CH2Cl2 (4 mL). The mixture was allowed to warm to room temperature, and, after 90 minutes had elapsed, it was concentrated on to silica gel. Purification of the residue by flash chromatography on silica gel (10 to 50% EtOAc/hexanes) afforded (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(bromomethyl)-5-(trifluoromethyl)benzyl]-4-methyl-1,3-oxazolidin-2-one. Rf=0.10 (50% EtOAc/hexanes). LCMS=564.0 (M+1)+. 1H NMR (CDCl3, 500 MHz) δ 7.88 (s, 1H), 7.78 (s, 2H), 7.63-7.57 (m, 2H), 7.52 (s, 1H), 5.79 (d, J=8.0 Hz, 1H), 5.09 (d, J=15.8 Hz, 1H), 4.61 (dd, J=13.8, 10.5 Hz, 2H), 4.27 (d, J=15.8 Hz, 1H), 4.06-1.00 (m, 1H), 0.82 (d, J=6.4 Hz, 3H).

Workup

  1. concentrationit was concentrated on to silica gel
  2. customPurification of the residue by flash chromatography on silica gel (10 to 50% EtOAc/hexanes)

Sources & evidence

ORD record
ord-aefb59cd06c6417cb828c3e019c9d8ee
Source dataset
uspto-grants-2010_08
Patent number
US07781426B2

Reaction notes

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