Benzenamine, 2-bromo-4-nitro- → 2-(Cyclopropylethynyl)-4-nitroaniline

HRID 1908414

Reaction equation

HRID 1908414 reaction equation
Br[C:2]1[CH:8]=[C:7]([N+:9]([O-:11])=[O:10])[CH:6]=[CH:5][C:3]=1[NH2:4].[C:12]([CH:14]1[CH2:16][CH2:15]1)#[CH:13]>C(N(CC)CC)C.[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>[CH:14]1([C:12]#[C:13][C:2]2[CH:8]=[C:7]([N+:9]([O-:11])=[O:10])[CH:6]=[CH:5][C:3]=2[NH2:4])[CH2:16][CH2:15]1

Participants

6

Reactant 2

HCID 25840Benzenamine, 2-bromo-4-nitro-HCID 138823Cyclopropylacetylene

Product 1

HCID 591292622-(Cyclopropylethynyl)-4-nitroanilineYield 23,243.199%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 8471TriethylamineSolvent

Conditions

Temperature
70 °C

Procedure

To a deoxygenated solution of 2-bromo-4-nitroaniline (2.17 g, 0.01 mmol), ethynyl-cyclopropane (1 g, 15 mmol) and CuI (10 mg, 0.05 mmol) in triethylamine (20 mL) was added Pd(PPh3)2Cl2 (210 mg, 0.3 mmol) under N2. The mixture was heated at 70° C. and stirred for 24 hours. The solid was filtered off and washed with EtOAc (50 mL×3). The filtrate was evaporated under reduced pressure, and the residue was purified by column chromatography on silica gel (petroleum ether/ethyl acetate=10/1) to give 2-(cyclopropylethynyl)-4-nitroaniline (470 mg, 23%). 1H NMR (300 MHz, CDCl3) δ 8.14 (d, J=2.7 Hz, 1H), 7.97 (dd, J=2.7, 9.0 Hz, 1H), 6.63 (d, J=9.0 Hz, 1H), 4.81 (brs, 2H), 1.55-1.46 (m, 1H), 0.98-0.90 (m, 2H), 0.89-0.84 (m, 2H).

Workup

  1. filtrationThe solid was filtered off
  2. washwashed with EtOAc (50 mL×3)
  3. customThe filtrate was evaporated under reduced pressure
  4. customthe residue was purified by column chromatography on silica gel (petroleum ether/ethyl acetate=10/1)

Sources & evidence

ORD record
ord-c60e827ce470400fbb4db0bcef8008bc
Source dataset
uspto-grants-2013_12
Patent number
US08598181B2

Linked notes

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