Sodium Sulfate → HCID 57539221, compound

HRID 2096917Notes

Reaction equation

HRID 2096917 reaction equation
[CH2:1]([N:8]([CH2:22][C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1)[C@H:9]([CH2:20][OH:21])[C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.S([O-])([O-])(=O)=O.[Na+].[Na+].[F:36][C:37]([F:45])(S(F)(=O)=O)C(O)=O>C(#N)C>[CH2:22]([N:8]([CH2:1][C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1)[C@H:9]([CH2:20][O:21][CH:37]([F:45])[F:36])[C:10]([O:12][CH2:13][C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1)=[O:11])[C:23]1[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=1

Participants

5

Reactant 3

HCID 24436Sodium SulfateHCID 27375162,2-Difluoro-2-(fluorosulfonyl)acetic acidHCID 40503070HCID 40503070, compound

Product 1

HCID 57539221HCID 57539221, compoundYield 13.4%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a mixture of Benzyl (2R)-2-(dibenzylamino)-3-hydroxypropanoate (22.2 g, 59.2 mmol) and sodium sulfate (2.0 g, 14 mmol) in acetonitrile (200 mL) at 40° C., difluoro(fluorosulfonyl)acetic acid (10.5 g, 59.2 mmol) was added dropwise for 1.5 hrs. The reaction mixture was concentrated to dryness. The residue was mixed with ethyl acetate and silica gel, then concentrated again and purified by column chromatography, eluting with 1.5-2.5% ethyl acetate in hexanes to give benzyl (2R) 2-dibenzylamino-3-difluoromethoxy-propionate (3.375 g, 13.4%) as a colorless oil. 1H NMR (300 MHz, CDCl3): (ppm) 7.20-7.40 (m, 15H), 6.17 (wt, 1H), 5.27 (q, 2H), 4.22 (dd, 1H), 4.10 (dd, 1H), 3.88 (d, 2H), 3.74 (t, 1H) and 3.65 (d, 2H).

Workup

  1. concentrationThe reaction mixture was concentrated to dryness
  2. additionThe residue was mixed with ethyl acetate and silica gel
  3. concentrationconcentrated again
  4. custompurified by column chromatography
  5. washeluting with 1.5-2.5% ethyl acetate in hexanes

Sources & evidence

ORD record
ord-87b1a3d12f7f48b5b4a0bd3f5a3a0b06
Source dataset
uspto-grants-2013_05
Patent number
US08450336B2

Reaction notes

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