Iodoethane → (R)-Ethyl 4-(4-bromophenyl)-3-((tert-butoxycarbonyl)amino)butanoate

HRID 1945038Notes

Reaction equation

HRID 1945038 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C@@H:9]([NH:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:10][C:11]([OH:13])=[O:12])=[CH:4][CH:3]=1.C([O-])(O)=O.[Na+].[CH2:27](I)[CH3:28]>CN(C=O)C>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:8][C@@H:9]([NH:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:10][C:11]([O:13][CH2:27][CH3:28])=[O:12])=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 6340IodoethaneHCID 516892Sodium BicarbonateHCID 7009737(3R)-4-(4-bromophenyl)-3-{[(tert-butoxy)carbonyl]amino}butanoic acid

Product 1

HCID 59607624(R)-Ethyl 4-(4-bromophenyl)-3-((tert-butoxycarbonyl)amino)butanoateYield 95.1%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a suspension of (R)-4-(4-bromophenyl)-3-(tert-butoxycarbonylamino)butanoic acid (9.98 g, 27.9 mmol) and NaHCO3 (4.68 g, 55.7 mmol) in DMF (45 mL) is added Ethyl iodide (6.75 mL, 84 mmol) at room temperature under nitrogen. After stirring for 71 hours, the reaction is quenched with H2O (300 mL), and then precipitated solid is collected and washed with H2O (500 mL) to give (R)-ethyl 4-(4-bromophenyl)-3-(tert-butoxycarbonylamino)butanoate (10.25 g, 94%). HPLC retention time=1.48 minutes (condition B); MS (ES+)=329.9 (m-tBu+2); 286.0 (m-Boc+2; 100%); 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.27 (t, J=7.2 Hz, 3H) 1.40 (s, 9H), 2.43 (A of ABX, Jab=15.8 Hz, Jax=5.7 Hz, 1H) 2.50 (B of ABX, Jab=15.8 Hz, Jbx=5.4 Hz, 1H) 2.74-2.90 (m, 2H) 4.11 (br s) 4.15 (q, J=7.1 Hz, 2H) 5.04 (br d) 7.07 (d, J=8.3 Hz, 2H) 7.40-7.43 (m, 2H).

Workup

  1. customthe reaction is quenched with H2O (300 mL)
  2. customprecipitated solid
  3. customis collected
  4. washwashed with H2O (500 mL)

Sources & evidence

ORD record
ord-5ac071126e534d04b8452b40d5b43357
Source dataset
uspto-grants-2013_03
Patent number
US08394853B2

Reaction notes

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