Ethylene Glycol → 4a-Methyl-6-(phenylsulfanyl)-1,2,3,4,4a,9-hexahydro[1]benzofuro[2,3-c]pyridine-2-carboxylic acid tert-butyl ester

HRID 1616873

Reaction equation

HRID 1616873 reaction equation
I[C:2]1[CH:3]=[CH:4][C:5]2[O:21][CH:9]3[CH2:10][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:12][CH2:13][C:8]3([CH3:22])[C:6]=2[CH:7]=1.CC(C)([O-])C.[Na+].C(O)CO.CN(C)C=O.[C:38]1([SH:44])[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=1>[Cu]I>[C:17]([O:16][C:14]([N:11]1[CH2:12][CH2:13][C:8]2([CH3:22])[C:6]3[CH:7]=[C:2]([S:44][C:38]4[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=4)[CH:3]=[CH:4][C:5]=3[O:21][CH:9]2[CH2:10]1)=[O:15])([CH3:20])([CH3:19])[CH3:18]

Participants

7

Reactant 5

HCID 174Ethylene GlycolHCID 6228DimethylformamideHCID 7969ThiophenolHCID 23676156Sodium t-butoxideHCID 68304820tert-butyl 6-iodo-4a-methyl-3,4,4a,9a-tetrahydro[1]benzofuro[2,3-c]pyridine-2(1H)-carboxylate

Product 1

HCID 673240934a-Methyl-6-(phenylsulfanyl)-1,2,3,4,4a,9-hexahydro[1]benzofuro[2,3-c]pyridine-2-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 1

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)Catalyst

Conditions

Temperature
120 °C

Procedure

Into a sealed tube was added tert-butyl 6-iodo-4a-methyl-3,4,4a,9a-tetrahydro[1]benzofuro[2,3-c]pyridine-2(1H)-carboxylate P24 (0.491 g, 1.18 mmol), sodium tert-butoxide (341 mg, 3.55 mmol), copper (I) iodide (20 mg, 0.08 mmol), 1,2-ethanediol (132 μL, 2.38 mmol), N,N-dimethylformamide (17 mL, 210 mmol), and benzenethiol (123 μL, 1.19 mmol). The reaction was heated at 120° C. overnight. The reaction was concentrated and partitioned between DCM and water. The DCM layer was washed with brine, dried, filtered and concentrated under vacuum. The crude product was dissolved in DCM and purified on a 12 g silica gel column eluting with hexanes to 2:1 hexanes:ethyl acetate to give the product which was taken directly into the next step.

Workup

  1. concentrationThe reaction was concentrated
  2. custompartitioned between DCM and water
  3. washThe DCM layer was washed with brine
  4. customdried
  5. filtrationfiltered
  6. concentrationconcentrated under vacuum
  7. dissolutionThe crude product was dissolved in DCM
  8. custompurified on a 12 g silica gel column
  9. washeluting with hexanes to 2:1 hexanes
  10. customethyl acetate to give the product which

Sources & evidence

ORD record
ord-452927a345a74663b64cdacc493db5b3
Source dataset
uspto-grants-2014_07
Patent number
US08765779B2

Linked notes

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