Ethyl Acetate → methyl 5-[2-[(tert-butoxycarbonyl)amino]phenyl]-4-(2-tert-butoxy-2-oxoethyl)-6-cyclohexyl-4H-thieno[3,2-b]pyrrole-2-carboxylate

HRID 1008970Notes

Reaction equation

HRID 1008970 reaction equation
Br[C:2]1[N:6]([CH2:7][C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[C:5]2[CH:15]=[C:16]([C:18]([O:20][CH3:21])=[O:19])[S:17][C:4]=2[C:3]=1[CH:22]1[CH2:27][CH2:26][CH2:25][CH2:24][CH2:23]1.[C:28]([O:32][C:33](=[O:50])[NH:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][C:36]=1B1OC(C)(C)C(C)(C)O1)([CH3:31])([CH3:30])[CH3:29].C([O-])([O-])=O.[Na+].[Na+].CCOC(C)=O>O1CCOCC1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[C:28]([O:32][C:33]([NH:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][C:36]=1[C:2]1[N:6]([CH2:7][C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[C:5]2[CH:15]=[C:16]([C:18]([O:20][CH3:21])=[O:19])[S:17][C:4]=2[C:3]=1[CH:22]1[CH2:27][CH2:26][CH2:25][CH2:24][CH2:23]1)=[O:50])([CH3:31])([CH3:29])[CH3:30]

Participants

7

Reactant 4

HCID 8857Ethyl AcetateHCID 10340Sodium CarbonateHCID 2773231tert-Butyl (2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)carbamateHCID 67298685methyl 5-bromo-4-(2-tert-butoxy-2-oxoethyl)-6-cyclohexyl-4H-thieno[3,2-b]pyrrole-2-carboxylate

Product 1

HCID 67298849methyl 5-[2-[(tert-butoxycarbonyl)amino]phenyl]-4-(2-tert-butoxy-2-oxoethyl)-6-cyclohexyl-4H-thieno[3,2-b]pyrrole-2-carboxylateYield 89%

Reagents, catalysts & solvents 2

HCID 178418476HCID 178418476, compoundCatalystHCID 312751,4-DioxaneSolvent

Procedure

A solution (0.15 M) of methyl 5-bromo-4-(2-tert-butoxy-2-oxoethyl)-6-cyclohexyl-4H-thieno[3,2-b]pyrrole-2-carboxylate (from Step 2) in dioxane was treated with tert-butyl-N-[2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]carbamate (1.5 eq.) and 2 N Na2CO3 solution (6 eq.) and degassed. PdCl2(PPh3)2 (0.2 eq.) was added and the suspension refluxed for 30 mins. After cooling, EtOAc was added and the solution was washed with water, brine, dried over sodium sulfate and evaporated in vacuo to give a residue which was purified by flash chromatography (PE:EtOAc, 95:5) to afford the title compound (89%) as a solid. 1H-NMR (400 MHz, DMSO-d6, 300 K, δ) 8.00 (s, 1H), 7.73 (m, 2H), 7.47-7.43 (t, J 8.6, 1H), 7.27-7.23 (m, 2H), 4.73-4.49 (dd, J 20, 2H), 3.82 (s, 3H), 2.17-2.11 (m, 1H), 1.82-1.21 (m, 10H), 1.37 (s, 9H), 1.28 (s, 9H). MS (ES+) m/z: 569 [M+H]+.

Workup

  1. customdegassed
  2. temperaturethe suspension refluxed for 30 mins
  3. temperatureAfter cooling
  4. washthe solution was washed with water, brine
  5. dry with materialdried over sodium sulfate
  6. customevaporated in vacuo
  7. customto give a residue which
  8. customwas purified by flash chromatography (PE:EtOAc, 95:5)

Sources & evidence

ORD record
ord-1ca3c3d3ed06468b857172805bd6eb1f
Source dataset
uspto-grants-2011_07
Patent number
US07973026B2

Reaction notes

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