Acetaldehyde → (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(ethylamino)-5-(trifluoromethoxy)benzyl]-4-methyl-1,3-oxazolidin-2-one

HRID 505288Notes

Reaction equation

HRID 505288 reaction equation
[NH2:1][C:2]1[CH:29]=[CH:28][C:27]([O:30][C:31]([F:34])([F:33])[F:32])=[CH:26][C:3]=1[CH2:4][N:5]1[C@@H:9]([CH3:10])[C@@H:8]([C:11]2[CH:16]=[C:15]([C:17]([F:20])([F:19])[F:18])[CH:14]=[C:13]([C:21]([F:24])([F:23])[F:22])[CH:12]=2)[O:7][C:6]1=[O:25].[CH:35](=O)[CH3:36].[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>ClC(Cl)C.CCOC(C)=O>[F:24][C:21]([F:22])([F:23])[C:13]1[CH:12]=[C:11]([C@H:8]2[O:7][C:6](=[O:25])[N:5]([CH2:4][C:3]3[CH:26]=[C:27]([O:30][C:31]([F:34])([F:33])[F:32])[CH:28]=[CH:29][C:2]=3[NH:1][CH2:35][CH3:36])[C@H:9]2[CH3:10])[CH:16]=[C:15]([C:17]([F:19])([F:20])[F:18])[CH:14]=1

Participants

6

Reactant 3

HCID 177Acetaldehyde3×HCID 5049666Sodium triacetoxyborohydrideHCID 57617867(4S,5R)-3-[2-amino-5-(trifluoromethoxy)benzyl]-5-[3,5-bis(trifluoromethyl)phenyl]-4-methyl-1,3-oxazolidin-2-one

Product 1

HCID 24896494(4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(ethylamino)-5-(trifluoromethoxy)benzyl]-4-methyl-1,3-oxazolidin-2-one

Reagents, catalysts & solvents 2

HCID 63651,1-DichloroethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of (4S,5R)-3-[2-amino-5-(trifluoromethoxy)benzyl]-5-[3,5-bis(trifluoromethyl)phenyl]-4-methyl-1,3-oxazolidin-2-one (80 mg, 0.159 mmol) in dichloroethane (1.6 mL) was added acetaldehyde (9 μL, 0.159 mmol) and NaBH(OAc)3 (67 mg, 0.318 mmol). The reaction was stirred at room temperature, and after 30 minutes acetaldehyde (4.5 μL, 0.80 mmol) was added. After an hour, additional acetaldehyde (4.5 μL, 0.80 mmol) was added. After an additional hour, the reaction was diluted with EtOAc (20 ml) and washed with saturated NH4Cl solution and brine (10 mL each). The organic layer was dried over Na2SO4, filtered, and concentrated. Purification of the residue by flash chromatography on silica gel (10 to 20% EtOAc/hexanes) afforded (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(ethylamino)-5-(trifluoromethoxy)benzyl]-4-methyl-1,3-oxazolidin-2-one. Rf=0.66 (25% EtOAc/hexanes). LCMS=531.2 (M+1)+. 1H NMR (CDCl3, 500 MHz), 7.88 (s, 1H), 7.73 (s, 2H), 7.10 (dd, J=2.1, 8.8 Hz, 1H), 6.90 (d, J=2.4 Hz, 1H), 6.59 (d, J=8.9 Hz, 1H), 5.66 (d, J=8.4 Hz, 1H), 4.81 (s, 1H), 4.70 (d, J=15.4 Hz, 1H), 4.08 (d, J=15.4 Hz, 1H), 4.06-4.00 (m, 1H), 3.20-3.13 (m, 2H), 1.32 (t, J=7.1 Hz, 3H), 0.78 (d, J=6.6 Hz, 3H).

Workup

  1. waitAfter an hour
  2. waitAfter an additional hour
  3. washwashed with saturated NH4Cl solution and brine (10 mL each)
  4. dry with materialThe organic layer was dried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customPurification of the residue by flash chromatography on silica gel (10 to 20% EtOAc/hexanes)

Sources & evidence

ORD record
ord-8a8eb390b47149d5ab942cf1050b4274
Source dataset
uspto-grants-2010_08
Patent number
US07781426B2

Reaction notes

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