Triethylamine → Tert-butyl 3-((2-amino-5-bromophenyl)ethynyl)pyrrolidine-1-carboxylate

HRID 1481731Notes

Reaction equation

HRID 1481731 reaction equation
[Br:1][C:2]1[CH:8]=[CH:7][C:5]([NH2:6])=[C:4](I)[CH:3]=1.[C:10]([CH:12]1[CH2:16][CH2:15][N:14]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH2:13]1)#[CH:11].CCN(CC)CC>[Cu]I.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.C(#N)C>[NH2:6][C:5]1[CH:7]=[CH:8][C:2]([Br:1])=[CH:3][C:4]=1[C:11]#[C:10][CH:12]1[CH2:16][CH2:15][N:14]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH2:13]1

Participants

7

Reactant 3

HCID 8471TriethylamineHCID 8239344-Bromo-2-iodoanilineHCID 54012212tert-Butyl 3-ethynylpyrrolidine-1-carboxylate

Product 1

HCID 89421756Tert-butyl 3-((2-amino-5-bromophenyl)ethynyl)pyrrolidine-1-carboxylateYield 95%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 6342AcetonitrileSolvent

Conditions

Temperature
70 °C

Procedure

4-Bromo-2-iodoaniline (3.88 g, 19.88 mmol), tert-butyl 3-ethynylpyrrolidine-1-carboxylate (4.90 g, 16.45 mmol), CuI (65 mg, 0.34 mmol, 2 mol %) and Pd(PPh3)2Cl2 (115 mg, 0.16 mmol, 1 mol %) were mixed together under argon in a heat-gun dried flask. Acetonitrile (17 mL) and NEt3 (4.60 mL, 33.00 mmol) were added to the mixture and reaction was heated at 70° C. for 1.5 h. TLC showed complete consumption of the alkyne. Acetonitrile was concentrated under reduced pressure and EtOAc (100 mL) was added to the residue. Triethylamine salt was filtered off and washed with EtOAc. Mother liquor was concentrated and residue was purified by column chromatography using EtOAc/hexanes (gradient 0-40%) to afford tert-butyl 3-((2-amino-5-bromophenyl)ethynyl)pyrrolidine-1-carboxylate (5.69 g) in 95% yield.

Workup

  1. customdried flask
  2. customconsumption of the alkyne
  3. concentrationAcetonitrile was concentrated under reduced pressure and EtOAc (100 mL)
  4. additionwas added to the residue
  5. filtrationTriethylamine salt was filtered off
  6. washwashed with EtOAc
  7. concentrationMother liquor was concentrated
  8. customresidue was purified by column chromatography

Sources & evidence

ORD record
ord-0dc851f2de414b0eb8f0bf979c673158
Source dataset
uspto-grants-2016_08
Patent number
US09409905B2

Reaction notes

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