Pyridine → Benzo[b]thiophene-6-carbonitrile

HRID 402116

반응식

HRID 402116 반응식
Br[C:2]1[S:6][C:5]2[CH:7]=[CH:8][CH:9]=[CH:10][C:4]=2[CH:3]=1.[N:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.[Cu]C#N.C(N)CN>CN(C)C=O.O>[C:12]([C:10]1[C:4]2[CH:3]=[CH:2][S:6][C:5]=2[CH:7]=[CH:8][CH:9]=1)#[N:11].[C:16]([C:15]1[CH:14]=[CH:13][C:12]2[CH:3]=[CH:2][S:6][C:5]=2[CH:4]=1)#[N:11]

참가 물질

8

반응물 4

HCID 1049PyridineHCID 3301EthylenediamineHCID 947862-Bromobenzo(b)thiopheneHCID 178418546HCID 178418546, 화합물

생성물 2

HCID 21816574Benzo[b]thiophene-6-carbonitrile수율 41%HCID 218165751-Benzothiophene-4-carbonitrile수율 39%

시약·촉매·용매 2

HCID 962Water용매HCID 6228Dimethylformamide용매

반응 조건

온도
60 °C

실험 절차

To a solution of the isomeric bromobenzo[b]thiophene (14.2 g, 66.5 mmol) from Step B above in N,N-dimethylformamide (130 mL) were added pyridine (7.5 mL) and copper(I) cyanide (7.75 g). The reaction mixture was heated under reflux for 20 hours. The reaction solution was then cooled to 60° C. and poured into a solution of ethylene diamine in water. The resultant mixture was stirred for 30 minutes and extracted with diethyl ether and ethyl acetate. The combined organic extract was washed with 1:1 brine/water, dried over sodium sulfate and concentrated under reduced pressure. The crude product obtained was purified by flash column chromatography (95:5 to 91:9 hexanes/ethyl acetate) to give 4-cyanobenzo[b]thiophene (4.15 g, 39%) as a light yellow solid, and 6-cyanobenzo[b]thiophene (4.34 g, 41%) as a reddish oil: 1H NMR for 4-cyanobenzo[b]thiophene (CDCl3, 500 MHz) δ8.10 (d, J=8.2 Hz, 1H), 7.74-7.70 (m, 2H), 7.62 (dd, J=5.5, 0.6 Hz, 1H), 7.43 (d, J=7.8 Hz, 1H); 1H NMR for 6-cyanobenzo[b]thiophene (CDCl3, 500 MHz) δ 8.22 (app s, 1H), 7.90 (d, J=8.3 Hz, 1H), 7.72 (d, J=5.4 Hz, 1H), 7.59 (d, J=8.3 Hz, 1H), 7.42 (dd, J=5.4, 0.5 Hz, 1H).

후처리

  1. temperatureThe reaction mixture was heated
  2. temperatureunder reflux for 20 hours
  3. extractionextracted with diethyl ether and ethyl acetate
  4. extractionThe combined organic extract
  5. washwas washed with 1:1 brine/water
  6. dry with materialdried over sodium sulfate
  7. concentrationconcentrated under reduced pressure
  8. customThe crude product obtained
  9. customwas purified by flash column chromatography (95:5 to 91:9 hexanes/ethyl acetate)

출처 및 근거

ORD 기록
ord-34745c226dca440c9f44451d91ddf59c
출처 데이터셋
uspto-grants-2014_06
특허 번호
US08741901B2

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