Potassium Carbonate → 1-tert-butyl 2-methyl 3-phenyl-1H-pyrrole-1,2-dicarboxylate

HRID 2170135

反応式

HRID 2170135 の反応式
Br[C:2]1[CH:6]=[CH:5][N:4]([C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[C:3]=1[C:14]([O:16][CH3:17])=[O:15].C([O-])([O-])=O.[K+].[K+].[C:24]1(B(O)O)[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1>C1(C)C=CC=CC=1.O.[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.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:24]1([C:2]2[CH:6]=[CH:5][N:4]([C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[C:3]=2[C:14]([O:16][CH3:17])=[O:15])[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1

参加物

8

反応物 3

HCID 11430Potassium CarbonateHCID 66827Phenylboronic AcidHCID 441898031-tert-butyl 2-methyl 3-bromo-1H-pyrrole-1,2-dicarboxylate

生成物 1

HCID 903861371-tert-butyl 2-methyl 3-phenyl-1H-pyrrole-1,2-dicarboxylate収率 65.9%

試薬・触媒・溶媒 4

HCID 74236Tetrabutylammonium Bromide触媒HCID 178418397HCID 178418397、化合物触媒HCID 962Water溶媒HCID 1140Toluene溶媒

実験手順

To a solution of 1-tert-butyl 2-methyl 3-bromo-1H-pyrrole-1,2-dicarboxylate (17.6 g, 57.9 mmol) in toluene (200 mL) and water (200 mL) was added K2CO3 (64.0 g, 463 mmol), followed by phenylboronic acid (10.6 g, 87.0 mmol) and tetrabutylammonium bromide (1.68 g, 5.21 mmol). The reaction mixture degassed for 10 min with nitrogen and then tetrakis(triphenylphosphine)palladium (1.34 g, 1.16 mmol) was added. The resulting slurry was degassed with nitrogen for 30 min and then heated to reflux for 16 h. The reaction mixture was concentrated under reduced pressure to remove water and toluene. Water was then added to the residue and the mixture extracted by ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by column chromatography using CombiFlash (REDISEP®, silica gel, 80 g, 20% EtOAc/hexanes) to obtain 1-tert-butyl 2-methyl 3-phenyl-1H-pyrrole-1,2-dicarboxylate (11.5 g, 65.9%) as a tan solid. 1H NMR (400 MHz, CD3OD) δ ppm 1.60 (s, 9H), 3.79 (s, 3H), 6.40 (d, J=3.4 Hz, 1H), 7.37 (m, 6H).

後処理

  1. customThe reaction mixture degassed for 10 min with nitrogen
  2. customThe resulting slurry was degassed with nitrogen for 30 min
  3. temperatureheated
  4. temperatureto reflux for 16 h
  5. concentrationThe reaction mixture was concentrated under reduced pressure
  6. customto remove water and toluene
  7. additionWater was then added to the residue
  8. extractionthe mixture extracted by ethyl acetate
  9. dry with materialThe combined organic layers were dried over sodium sulfate
  10. filtrationfiltered
  11. concentrationconcentrated under reduced pressure
  12. customThe residue was purified by column chromatography

出典と根拠

ORDレコード
ord-3086a1dc935540159e0598aa4019a92a
出典データセット
uspto-grants-2015_06
特許番号
US09050345B2

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