Sodium Carbonate → 1-(2-Bromocyclopenten-1-yl)-4-(methylthio)benzene

HRID 37518

反応式

HRID 37518 の反応式
Br[C:2]1[CH2:6][CH2:5][CH2:4][C:3]=1[Br:7].[CH3:8][S:9][C:10]1[CH:15]=[CH:14][C:13](B(O)O)=[CH:12][CH:11]=1.C([O-])([O-])=O.[Na+].[Na+]>C1(C)C=CC=CC=1.C(O)C.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>[Br:7][C:3]1[CH2:4][CH2:5][CH2:6][C:2]=1[C:13]1[CH:14]=[CH:15][C:10]([S:9][CH3:8])=[CH:11][CH:12]=1

参加物

7

反応物 3

HCID 10340Sodium CarbonateHCID 27339594-(Methylthio)phenylboronic acidHCID 44385281,2-Dibromocyclopentene

生成物 1

HCID 102650591-(2-Bromocyclopenten-1-yl)-4-(methylthio)benzene収率 32.6%

試薬・触媒・溶媒 3

HCID 178418397HCID 178418397、化合物触媒HCID 702Ethanol溶媒HCID 1140Toluene溶媒

実験手順

Under nitrogen, 36.4 g (161 mmol) of 1,2-dibromocyclopentene (Aldrich) was reacted with 18.0 g (107 mmol) of 4-methylthiophenylboronic acid (Step 1) in 550 mL of toluene, 365 mL of ethanol, and 235 mL of 2M Na2CO3 in the presence of 6.0 g (5 mol %) of Pd(PPh3)4. The reaction was vigorously stirred at reflux overnight and concentrated in vacuo. The residue was dissolved in ethyl acetate and washed with water, dried (MgSO4), and reconcentrated. Purification by silica gel chromatography (Waters Prep-500) with hexane gave 9.39 g (22%) of 1-(2-bromocyclopenten-1-yl)-4-(methylthio)benzene (38 in Synthetic Scheme X when R5 =SCH3 and R1, R2, R3, R4, R6, and R7 =H) as a solid: mp 52°-54° C.; NMR (CDCl3) d 1.98-2.09 (m, 2H), 2.50 (s, 3H), 2.70-2.78 (m, 2H), 2.80-2.89 (m, 2H), 7.24 (d, J=8 Hz, 2H), 7.55 (d, J=8 Hz, 2H).

後処理

  1. temperatureat reflux overnight
  2. concentrationconcentrated in vacuo
  3. dissolutionThe residue was dissolved in ethyl acetate
  4. washwashed with water
  5. dry with materialdried (MgSO4)
  6. customPurification by silica gel chromatography (Waters Prep-500) with hexane

出典と根拠

ORDレコード
ord-96aea4226b844c8494d24a985e83b967
出典データセット
uspto-grants-1995_05
特許番号
US05420287

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