Sodium Iodide → 5-acetyl-4-oxo-5,6,7,8-tetrahydro-4H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester

HRID 481081

Reaction equation

HRID 481081 reaction equation
[Bi](Cl)(Cl)Cl.[I-].[Na+].[C:7](Cl)(=[O:9])[CH3:8].[CH2:11]([O:13][C:14]([C:16]1[C:17]2[C:32]([O:33][Si](C)(C)C)=[CH:31][CH2:30][CH2:29][CH2:28][C:18]=2[N:19]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH:20]=1)=[O:15])[CH3:12]>C(Cl)Cl.CCOCC>[CH2:11]([O:13][C:14]([C:16]1[C:17]2[C:32](=[O:33])[CH:31]([C:7](=[O:9])[CH3:8])[CH2:30][CH2:29][CH2:28][C:18]=2[N:19]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH:20]=1)=[O:15])[CH3:12]

Participants

6

Reactant 4

HCID 5238Sodium IodideHCID 6367Acetyl chlorideHCID 24591Bismuth trichlorideHCID 207622254-trimethylsilanyloxy-7,8-dihydro-6H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester

Product 1

HCID 206056545-acetyl-4-oxo-5,6,7,8-tetrahydro-4H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl esterYield 86%

Reagents, catalysts & solvents 1

HCID 21881112Ethyl ether methylene chlorideSolvent

Procedure

Bismuth (III) chloride (0.1 mmol) and sodium iodide (0.3 mmol) are transferred to a dried flask under nitrogen and 5 mL of a mixture of CH2Cl2/ether (9/1) is added by a syringe. This is followed by the addition of acetyl chloride (2.2 mmol) and the suspension is stirred for 5 min at RT. 4-trimethylsilanyloxy-7,8-dihydro-6H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester (2 mmol) in 5 mL of the same solvent mixture is added. After 2 hours at RT, the mixture is quenched with 20 mL saturated NaHCO3 solution and extracted several times with CH2Cl2. The organic layers are combined, dried over Na2SO4 and evaporated in vacuo yielding 5-acetyl-4-oxo-5,6,7,8-tetrahydro-4H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester as an oil (86%). LRMS 363.4 found (M+1) 364.2

Workup

  1. waitAfter 2 hours at RT
  2. customthe mixture is quenched with 20 mL saturated NaHCO3 solution
  3. extractionextracted several times with CH2Cl2
  4. dry with materialdried over Na2SO4
  5. customevaporated in vacuo

Sources & evidence

ORD record
ord-d3e8e5426a5845489a4b72e08857e8b7
Source dataset
uspto-grants-2003_11
Patent number
US06653471B2

Linked notes

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