Ethanolamine → HCID 18345885, compound

HRID 2368893Notes

Reaction equation

HRID 2368893 reaction equation
CS(O[CH2:6][C@H:7]([CH3:15])[CH2:8][CH2:9]OS(C)(=O)=O)(=O)=O.[NH2:16][CH2:17][CH2:18][OH:19].C([O-])([O-])=O.[K+].[K+].C(Cl)Cl>C(#N)C.O>[CH3:15][C@@H:7]1[CH2:8][CH2:9][N:16]([CH2:17][CH2:18][OH:19])[CH2:6]1

Participants

7

Reactant 4

HCID 700EthanolamineHCID 6344DichloromethaneHCID 11430Potassium Carbonate2×HCID 10858216HCID 10858216, compound

Product 1

HCID 18345885HCID 18345885, compoundYield 28.2%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6342AcetonitrileSolvent

Procedure

A mixture of (R)-2-methylbutane-1,4-diyl dimethanesulfonate (30 g, 0.115 mol), 2-aminoethanol (7.0 g, 0.115 mol), and K2CO3 (31.7 g, 0.23 mol) in acetonitrile (0.9 L) was refluxed for 20 h. The mixture was cooled to room temperature and concentrated under vacuum to afford a residue (a mixture of oil and solid). DCM (300 mL) and sat'd K2CO3 solution (300 mL) were added and just enough water was added to dissolve all solid. The organic layer was separated, and aqueous phase was further extracted with DCM (2×300 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo. Purification by flash column chromatography [EA/Hex/MeOH/TEA=10:7:2:1] gave (R)-2-(3-methylpyrrolidin-1-yl)ethanol (4.19 g, 28%). 1H NMR (CDCl3): δ 3.61 (t, 2H), 2.84 (dd, 1H), 2.70 (m, 1H), 2.65 (m, 1H), 2.62 (m, 1H), 2.54 (m, 1H), 2.25 (m, 1H), 2.11 (dd, 1H), 2.03 (m, 1H), 1.36 (m, 1H), 1.03 (d, 3H); MS: 130.2 (M+H)+.

Workup

  1. temperaturewas refluxed for 20 h
  2. concentrationconcentrated under vacuum
  3. customto afford a residue (
  4. additiona mixture of oil and solid)
  5. additionwere added
  6. dissolutionto dissolve all solid
  7. customThe organic layer was separated
  8. extractionaqueous phase was further extracted with DCM (2×300 mL)
  9. dry with materialThe combined organic layers were dried over MgSO4
  10. filtrationfiltered
  11. concentrationconcentrated in vacuo
  12. customPurification by flash column chromatography [EA/Hex/MeOH/TEA=10:7:2:1]

Sources & evidence

ORD record
ord-b95f43cc42434bf18066e69dec8a9a29
Source dataset
uspto-grants-2014_04
Patent number
US08703810B2

Reaction notes

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