Methyl iodide → N-(tert-butoxycarbonyl)-4-(2,6-dichlorobenzyloxy)-3-methoxy-L-phenylalanine methyl ester

HRID 24657Notes

Reaction equation

HRID 24657 reaction equation
[CH3:1][O:2][C:3](=[O:31])[C@H:4]([CH2:13][C:14]1[CH:19]=[CH:18][C:17]([O:20][CH2:21][C:22]2[C:27]([Cl:28])=[CH:26][CH:25]=[CH:24][C:23]=2[Cl:29])=[C:16]([OH:30])[CH:15]=1)[NH:5][C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7].[C:32]([O-])([O-])=O.[K+].[K+].CI>[N+](CCCC)(CCCC)(CCCC)CCCC.[I-].COCCOC>[CH3:1][O:2][C:3](=[O:31])[C@H:4]([CH2:13][C:14]1[CH:19]=[CH:18][C:17]([O:20][CH2:21][C:22]2[C:23]([Cl:29])=[CH:24][CH:25]=[CH:26][C:27]=2[Cl:28])=[C:16]([O:30][CH3:32])[CH:15]=1)[NH:5][C:6]([O:8][C:9]([CH3:12])([CH3:10])[CH3:11])=[O:7]

Participants

6

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 54150347N-(tert-butoxycarbonyl)-4-(2,6-dichlorobenzyloxy)-3-hydroxy-L-phenylalanine methyl ester

Product 1

HCID 54531505N-(tert-butoxycarbonyl)-4-(2,6-dichlorobenzyloxy)-3-methoxy-L-phenylalanine methyl esterYield 85.5%

Reagents, catalysts & solvents 2

HCID 67553Tetrabutylammonium IodideCatalystHCID 80711,2-DimethoxyethaneSolvent

Procedure

To a suspension of N-(tert-butoxycarbonyl)-4-(2,6-dichlorobenzyloxy)-3-hydroxy-L-phenylalanine methyl ester (0.45 g), K2CO3 (0.199 g), and n-Bu4NI (0.035 g) in DME (4.0 mL) was added CH3I (0.072 mL) and the mixture was stirred overnight at room temperature. DMF was removed and the residue was partitioned between water and EtOAc. The organic layer was separated and the aqueous solution was extracted with EtOAc. The combined extract was dried (MgSO4) and evaporated. The residue was purified by preparative TLC (silica gel; eluent: hexanes/CH2Cl2/EtOAc, 3:3:1) to yield 0.396 g of N-(tert-butoxycarbonyl)-4-(2,6-dichlorobenzyloxy)-3-methoxy-L-phenylalanine methyl ester. ESMS: m/z 484 (MH+).

Workup

  1. customDMF was removed
  2. customthe residue was partitioned between water and EtOAc
  3. customThe organic layer was separated
  4. extractionthe aqueous solution was extracted with EtOAc
  5. extractionThe combined extract
  6. dry with materialwas dried (MgSO4)
  7. customevaporated
  8. customThe residue was purified by preparative TLC (silica gel; eluent: hexanes/CH2Cl2/EtOAc, 3:3:1)

Sources & evidence

ORD record
ord-cde8ff367da34073a090ca5d91002c80
Source dataset
uspto-grants-2005_02
Patent number
US06855843B2

Reaction notes

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