N-bromobutanimide → tert-Butyl {(3R)-1-[7-bromo-5-(2-chlorobenzyl)-1,3-dimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl]piperidin-3-yl}carbamate

HRID 1819312Notes

Reaction equation

HRID 1819312 reaction equation
[Cl:1][C:2]1[CH:35]=[CH:34][CH:33]=[CH:32][C:3]=1[CH2:4][N:5]1[C:13]2[C:12](=[O:14])[N:11]([CH3:15])[C:10](=[O:16])[N:9]([CH3:17])[C:8]=2[CH:7]=[C:6]1[N:18]1[CH2:23][CH2:22][CH2:21][C@@H:20]([NH:24][C:25](=[O:31])[O:26][C:27]([CH3:30])([CH3:29])[CH3:28])[CH2:19]1.[Br:36]N1C(=O)CCC1=O.S([O-])(O)(=O)=O.[K+]>CN(C)C=O>[Br:36][C:7]1[C:8]2[N:9]([CH3:17])[C:10](=[O:16])[N:11]([CH3:15])[C:12](=[O:14])[C:13]=2[N:5]([CH2:4][C:3]2[CH:32]=[CH:33][CH:34]=[CH:35][C:2]=2[Cl:1])[C:6]=1[N:18]1[CH2:23][CH2:22][CH2:21][C@@H:20]([NH:24][C:25](=[O:31])[O:26][C:27]([CH3:29])([CH3:30])[CH3:28])[CH2:19]1

Participants

5

Reactant 3

HCID 67184N-bromobutanimideHCID 516920Potassium bisulfateHCID 57886903tert-Butyl {(3R)-1-[5-(2-chlorobenzyl)-1,3-dimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl]piperidin-3-yl}carbamate

Product 1

HCID 57886890tert-Butyl {(3R)-1-[7-bromo-5-(2-chlorobenzyl)-1,3-dimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl]piperidin-3-yl}carbamateYield 98.8%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of tert-butyl {(3R)-1-[5-(2-chlorobenzyl)-1,3-dimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl]piperidin-3-yl}carbamate (1.00 g) in N,N-dimethylformamide (20 ml) was added N-bromosuccinimide (392 mg), and the resulting mixture was stirred overnight at room temperature. The reaction solution was adjusted to pH 2 with a 10% aqueous potassium hydrogensulfate solution and extracted with ethyl acetate (200 ml). The organic layer was washed with a 10% aqueous potassium hydrogensulfate solution and a saturated aqueous sodium chloride solution, dried over sodium sulfate and then filtered and the filtrate was concentrated under reduced pressure. The resulting residue was purified by a silica gel column chromatography (hexane/ethyl acetate=2/1) to obtain the title compound (1.143 g).

Workup

  1. extractionextracted with ethyl acetate (200 ml)
  2. washThe organic layer was washed with a 10% aqueous potassium hydrogensulfate solution
  3. dry with materiala saturated aqueous sodium chloride solution, dried over sodium sulfate
  4. filtrationfiltered
  5. concentrationthe filtrate was concentrated under reduced pressure
  6. customThe resulting residue was purified by a silica gel column chromatography (hexane/ethyl acetate=2/1)

Sources & evidence

ORD record
ord-af08e07dafaf4e39888033f93f8422cc
Source dataset
uspto-grants-2009_10
Patent number
US07601728B2

Reaction notes

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