Ethanolamine → N-(2-Hydroxyethyl)docosa-4,7,10,13,16,19-hexaenamide

HRID 926906Notes

Reaction equation

HRID 926906 reaction equation
[C:1]([OH:24])(=O)[CH2:2][CH2:3]/[CH:4]=[CH:5]\[CH2:6]/[CH:7]=[CH:8]\[CH2:9]/[CH:10]=[CH:11]\[CH2:12]/[CH:13]=[CH:14]\[CH2:15]/[CH:16]=[CH:17]\[CH2:18]/[CH:19]=[CH:20]\[CH2:21][CH3:22].[CH2:25]([CH2:27][NH2:28])[OH:26].CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.CCN(C(C)C)C(C)C>CC#N.CCOC(C)=O>[OH:26][CH2:25][CH2:27][NH:28][C:1](=[O:24])[CH2:2][CH2:3]/[CH:4]=[CH:5]\[CH2:6]/[CH:7]=[CH:8]\[CH2:9]/[CH:10]=[CH:11]\[CH2:12]/[CH:13]=[CH:14]\[CH2:15]/[CH:16]=[CH:17]\[CH2:18]/[CH:19]=[CH:20]\[CH2:21][CH3:22]

Participants

7

Reactant 4

HCID 700EthanolamineHCID 81531DiisopropylethylamineHCID 445580DoconexentHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)

Product 1

HCID 5283451N-(2-Hydroxyethyl)docosa-4,7,10,13,16,19-hexaenamide

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

(4Z,7Z,10Z,13Z,16Z,19Z)-Docosa-4,7,10,13,16,19-hexaenoic acid (DHA, 1.2 g, 3.66 mmol) was taken up in 20 mL of CH3CN along with ethanolamine (220 μl, 3.66 mmol), HATU (1.5 g, 4.0 mmol) and DIEA (950 μl, 5.49 mmol). The resulting reaction mixture was stirred at room temperature for 2 h and then diluted with EtOAc. The organic layer was washed with saturated aqueous NaHCO3, brine, dried (Na2SO4) and concentrated under reduced pressure to afford crude (4Z,7Z,10Z,13Z,16Z,19Z)—N—(2-hydroxyethyl)docosa-4,7,10,13,16,19-hexaenamide. This material was taken up in 15 mL of CH2Cl2 along with (E)-methyl 4-chloro-4-oxobut-2-enoate (3.66 mmol) and triethylamine (765 μl, 5.49 mmol). The resulting reaction mixture was stirred at room temperature for 18 h. It was then diluted with CH2Cl2 and washed with brine. The organic layer was dried (Na2SO4) and concentrated under reduced pressure. Purification by chromatography (60% EtOAc, 40% pentane) afforded 380 mg of 2-(4Z,7Z,10Z,13Z,16Z,19Z) -docosa-4,7,10,13,16,19-hexaenamidoethyl methyl fumarate (21% yield). MS (EI) calcd for C29H41NO5: 483.3; found: 484 (M+1).

Workup

  1. customThe resulting reaction mixture
  2. washThe organic layer was washed with saturated aqueous NaHCO3, brine
  3. dry with materialdried (Na2SO4)
  4. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-c1f785b7f80f4662845b6928bf1f7d1e
Source dataset
uspto-grants-2016_03
Patent number
US09289503B2

Reaction notes

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