Sodium Bicarbonate → (2R*,3S*)-3-hydroxy-4-methyl-2-[(4-phenylphenyl)-methoxy-carbonylamino]-pentanoic acid

HRID 530560Notes

Reaction equation

HRID 530560 reaction equation
[NH2:1][C@H:2]([C@@H:6]([OH:10])[CH:7]([CH3:9])[CH3:8])[C:3]([OH:5])=[O:4].C([O-])(O)=O.[Na+].[C:16](=O)([O-:37])[O:17][C:18]1C(C)=C(C2C=CC(C3C=CC=CC=3)=CC=2)C=CN=1.[C:39]1([C:45]2[CH:50]=[CH:49][C:48](C3C=CN(C([O-])=O)C(=O)C=3C)=[CH:47][CH:46]=2)[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=1>O.C1COCC1>[OH:10][C@@H:6]([CH:7]([CH3:9])[CH3:8])[C@@H:2]([N:1]([C:48]1[CH:47]=[CH:46][C:45]([C:39]2[CH:40]=[CH:41][CH:42]=[CH:43][CH:44]=2)=[CH:50][CH:49]=1)[C:16]([O:17][CH3:18])=[O:37])[C:3]([OH:5])=[O:4]

Participants

7

Reactant 4

HCID 516892Sodium BicarbonateHCID 2724869(2R,3S)-2-amino-3-hydroxy-4-methylpentanoic acidHCID 86699987(4-Phenylphenyl)-methyl-2-pyridyl carbonateHCID 86699989(4-Phenylphenyl)-methyl-2-oxopyridine-1-carboxylate

Product 1

HCID 86700003(2R*,3S*)-3-hydroxy-4-methyl-2-[(4-phenylphenyl)-methoxy-carbonylamino]-pentanoic acidYield 50%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a stirred diastereomeric mixture containing (2R*,3R*)- and (2R*,3S*)-2-amino-3-hydroxy-4-methyl-pentanoic acid (0.05 g, 0.34 mmol) and NaHCO3 (0.03 g, 0.34 mmol) in H2O (2.0 mL), at rt, the isomeric mixture containing (4-phenylphenyl)-methyl-2-pyridyl carbonate and (4-phenylphenyl)-methyl-2-oxopyridine-1-carboxylate (0.45 g, 1.48 mmol) [prepared as for example 17, step 1] in THF (2.0 mL) was added. After 15 h at rt, the crude mixture was rotary evaporated to remove the organics and subsequently extracted with Et2O (3×10 mL). The aqueous phase was acidified with 2.0 M HCl solution to pH 2-3 and subsequently extracted with AcOEt (3×20 mL). The organic fraction was dried over Na2SO4, filtered and concentrated to dryness to afford the title compound (0.06 g, 50% over 2 steps), as a diastereoisomeric mixture (anti:syn=8:2), as an off-white solid, which was used in the next step without further purification. MS (ESI) m/z: 358 [M−H]+; (ESI) m/z: 356 [M−H]−. 1H NMR (DMSO-d6) δ 0.82 (d, J=6.55 Hz, 3H), 0.88 (d, J=6.92 Hz, 3H), 1.62-1.79 (m, 1H), 3.17 (dd, J=2.87, 9.15 Hz, 1H), 3.51 (d, J=9.16 Hz, 1H), 5.05 (s, 2H), 7.32-7.41 (m, 1H), 7.41-7.52 (m, 4H), 7.66 (td, J=1.74, 6.70, 7.42 Hz, 4H) (reported data refer to the major anti diastereoisomer).

Workup

  1. additionwas added
  2. customthe crude mixture was rotary evaporated
  3. customto remove the organics and
  4. extractionsubsequently extracted with Et2O (3×10 mL)
  5. extractionsubsequently extracted with AcOEt (3×20 mL)
  6. dry with materialThe organic fraction was dried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated to dryness

Sources & evidence

ORD record
ord-ab520d7c4f004a608b0549a238a29c83
Source dataset
uspto-grants-2016_05
Patent number
US09353075B2

Reaction notes

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