Water → Benzyl (2S,3R)-2-(Boc-amino)-3-hydroxy-3-(4-methoxyphenyl)propanoate

HRID 58866Notes

Reaction equation

HRID 58866 reaction equation
[CH2:1](Br)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:9]([O:13][C:14]([NH:16][C@@H:17]([C@H:21]([OH:30])[C:22]1[CH:27]=[CH:26][C:25]([O:28][CH3:29])=[CH:24][CH:23]=1)[C:18]([OH:20])=[O:19])=[O:15])([CH3:12])([CH3:11])[CH3:10].C([O-])([O-])=O.[Cs+].[Cs+].O>CN(C=O)C>[C:9]([O:13][C:14]([NH:16][C@@H:17]([C@H:21]([OH:30])[C:22]1[CH:27]=[CH:26][C:25]([O:28][CH3:29])=[CH:24][CH:23]=1)[C:18]([O:20][CH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)=[O:19])=[O:15])([CH3:12])([CH3:11])[CH3:10]

Participants

6

Reactant 4

HCID 962WaterHCID 7498Benzyl BromideHCID 10796Cesium carbonateHCID 14110515(2S,3R)-2-((tert-Butoxycarbonyl)amino)-3-hydroxy-3-(4-methoxyphenyl)propanoic acid

Product 1

HCID 131737022Benzyl (2S,3R)-2-(Boc-amino)-3-hydroxy-3-(4-methoxyphenyl)propanoateYield 71.4%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Benzyl bromide (4.40 g, 25.7 mmol) was added dropwise to a mixture of (2S,3R)-2-(tert-butoxycarbonylamino)-3-hydroxy-3-(4-methoxyphenyl)propanoic acid (4.00 g, 12.9 mmol) and Cs2CO3 (4.20 g, 12.9 mmol) in DMF (80 mL) at 0° C. The reaction mixture was allowed to warm to ambient temperature and stirred for 1 h. Water (80 mL) was added and the resulting mixture was extracted with EtOAc (100 mL×2). The combined extracts were washed with water (100 mL) and brine (100 mL), dried over anhydrous sodium sulfate, and concentrated. The residue was purified by flash column chromatography on silica gel (petroleum ether/EtOAc=10:1 to 4:1) to afford (2S,3R)-benzyl 2-((tert-butoxycarbonyl)amino)-3-hydroxy-3-(4-methoxyphenyl)propanoate (3.7 g, 66% yield) as a colorless solid.

Workup

  1. extractionthe resulting mixture was extracted with EtOAc (100 mL×2)
  2. washThe combined extracts were washed with water (100 mL) and brine (100 mL)
  3. dry with materialdried over anhydrous sodium sulfate
  4. concentrationconcentrated
  5. customThe residue was purified by flash column chromatography on silica gel (petroleum ether/EtOAc=10:1 to 4:1)

Sources & evidence

ORD record
ord-ad1bdf8b1aac4ca799ba93a407c10f0f
Source dataset
uspto-grants-2016_09
Patent number
US09434761B2

Reaction notes

Loading…