Dimethylformamide → tert-Butyl 4-cyanophenethylcarbamate

HRID 2239558Notes

Reaction equation

HRID 2239558 reaction equation
Br[C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][NH:10][C:11](=[O:17])[O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[CH:4][CH:3]=1.[CH3:18][N:19](C=O)C>CCOC(C)=O.[C-]#N.[Zn+2].[C-]#N.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:18]([C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][NH:10][C:11](=[O:17])[O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[CH:4][CH:3]=1)#[N:19]

Participants

6

Reactant 2

HCID 6228DimethylformamideHCID 14221818[2-(4-Bromo-phenyl)ethyl]-carbamic acid tert-butyl ester

Product 1

HCID 21955533tert-Butyl 4-cyanophenethylcarbamateYield 88.9%

Reagents, catalysts & solvents 3

HCID 11186Zinc cyanide (Zn(CN)2)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
150 °C

Procedure

tert-Butyl [2-(4-bromophenyl)ethyl]carbamate (0.52 g, 1.73 mmol) was dissolved in dry DMF (17 mL) under nitrogen atmosphere. Zinc cyanide (0.41 g, 3.46 mmol) and tetrakis(triphenylphosphine)palladium (0.16 g, 0.14 mmol) was added. The reaction mixture was heated in a microwave reactor at 150° C. for 20 mins. The procedure was repeated two more times with equal amount of starting material and the resulting three mixtures were combined. The mixture was diluted with EtOAc, washed with saturated aqueous NaHCO3 and water, dried with Na2SO4, filtered and evaporated. The crude product was purified using Biotage Horizon HPFC system (40+M column, isocratic run DCM/MeOH (99.5:0.5, 960 mL), gradient run DCM/MeOH (99.5:0.5-92:8, 240 mL), isocratic run DCM/MeOH (92:8, 720 mL)) affording the title compound (1.14 g, 88.9%). 1H NMR (500 MHz, CDCl3): δ 1.44 (s, 9H), 2.88 (t, 2H), 3.40 (q, 2H), 4.58 (bs, 1H), 7.32 (d, 2H), 7.61 (d, 2H); Mass Spectrum: M+H+ 247.

Workup

  1. washwashed with saturated aqueous NaHCO3 and water
  2. dry with materialdried with Na2SO4
  3. filtrationfiltered
  4. customevaporated
  5. customThe crude product was purified

Sources & evidence

ORD record
ord-751dfd3f5b364f70b34192ebfe6d57a1
Source dataset
uspto-grants-2010_05
Patent number
US07723333B2

Reaction notes

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