Triethylamine → Acetic acid 2-acetoxy-1-{3-chlorocarbonyl-5-[(2,2-dimethyl-[1,3]-dioxolan-4-ylmethyl)-(2-hydroxy-ethyl)-carbamoyl]-2,4,6-triiodo-phenylcarbamoyl}-ethyl ester

HRID 2188505Notes

Reaction equation

HRID 2188505 reaction equation
[C:1]([O:4][CH2:5][CH:6]([O:25][C:26](=[O:28])[CH3:27])[C:7](=[O:24])[NH:8][C:9]1[C:14]([I:15])=[C:13]([C:16](Cl)=[O:17])[C:12]([I:19])=[C:11]([C:20]([Cl:22])=[O:21])[C:10]=1[I:23])(=[O:3])[CH3:2].[CH3:29][C:30]1([CH3:40])[O:34][CH:33]([CH2:35][NH:36][CH2:37][CH2:38][OH:39])[CH2:32][O:31]1.C(N(CC)CC)C>CC(N(C)C)=O>[C:1]([O:4][CH2:5][CH:6]([O:25][C:26](=[O:28])[CH3:27])[C:7](=[O:24])[NH:8][C:9]1[C:14]([I:15])=[C:13]([C:16](=[O:17])[N:36]([CH2:35][CH:33]2[CH2:32][O:31][C:30]([CH3:40])([CH3:29])[O:34]2)[CH2:37][CH2:38][OH:39])[C:12]([I:19])=[C:11]([C:20]([Cl:22])=[O:21])[C:10]=1[I:23])(=[O:3])[CH3:2]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 205536662-[(2,2-Dimethyl-[1,3]dioxolan-4-yl-methyl)-amino]-ethanolHCID 59413986Acetic acid 2-acetoxy-1-(3,5-bis-chlorocarbonyl-2,4,6-triiodo-phenylcarbamoyl)-ethyl ester

Product 1

HCID 59470592Acetic acid 2-acetoxy-1-{3-chlorocarbonyl-5-[(2,2-dimethyl-[1,3]-dioxolan-4-ylmethyl)-(2-hydroxy-ethyl)-carbamoyl]-2,4,6-triiodo-phenylcarbamoyl}-ethyl esterYield 38.5%

Reagents, catalysts & solvents 1

HCID 31374DimethylacetamideSolvent2×

Procedure

To a ice cooled solution of acetic acid 2-acetoxy-1-(3,5-bis-chlorocarbonyl-2,4,6-triiodo-phenylcarbamoyl)-ethyl ester (20 g, 0.026 mol) in anhydrous DMAC (20 ml) were added dropwise a solution of 2-[(2,2-Dimethyl-[1,3]dioxolan-4-yl-methyl)-amino]-ethanol (4.6 g, 0.026 mol) in DMAC (20 mL) followed by triethylamine (˜3 g). The mixture was stirred at room temperature for 24 h and then poured over icewater (0.75 liter). A white precipitate formed. This was collected and washed with cold water. The filter cake was then dissolved in ethyl acetate and washed with brine. The organics were collected, dried over MgSO4, filtered and evaporated to dryness. The product was purified by silica column chromatography eluting with Petroleum ether/ethyl acetate. Two peaks closely eluting at 80% ethyl acetate were analysed by NMR and mass spec, and show to both contain the desired material. These were combined post analysis to give the desired product (10 mmol, Yield=38%).

Workup

  1. additionpoured over icewater (0.75 liter)
  2. customA white precipitate formed
  3. customThis was collected
  4. washwashed with cold water
  5. dissolutionThe filter cake was then dissolved in ethyl acetate
  6. washwashed with brine
  7. customThe organics were collected
  8. dry with materialdried over MgSO4
  9. filtrationfiltered
  10. customevaporated to dryness
  11. customThe product was purified by silica column chromatography
  12. washeluting with Petroleum ether/ethyl acetate
  13. washTwo peaks closely eluting at 80% ethyl acetate

Sources & evidence

ORD record
ord-00f1b9709b5b4dd8b87d71ef956a6c2e
Source dataset
uspto-grants-2012_12
Patent number
US08323619B2

Reaction notes

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