Tin tetrachloride → Ethyl 4-[2,2-dimethyl-4-(tol-4-yl)-benzo(1,2-g)-chrom-3-en-7-yl]benzoate

HRID 2288310

反応式

HRID 2288310 の反応式
C(OP([C:9](OC)(OC)[CH2:10][CH2:11][C:12]1[CH:22]=[CH:21][C:15]([C:16]([O:18][CH2:19][CH3:20])=[O:17])=[CH:14][CH:13]=1)(OCC)=O)C.[Li]CCCC.[CH3:32][C:33]1([CH3:52])[CH:42]=[C:41]([C:43]2[CH:48]=[CH:47][C:46]([CH3:49])=[CH:45][CH:44]=2)[C:40]2[C:35](=[CH:36][CH:37]=[C:38]([CH:50]=O)[CH:39]=2)[O:34]1.Cl[Sn](Cl)(Cl)Cl>C1COCC1.CCCCCC.C(OCC)(=O)C.ClCCl>[CH2:19]([O:18][C:16](=[O:17])[C:15]1[CH:14]=[CH:13][C:12]([C:11]2[CH:50]=[CH:38][C:37]3[CH:36]=[C:35]4[C:40]([C:41]([C:43]5[CH:48]=[CH:47][C:46]([CH3:49])=[CH:45][CH:44]=5)=[CH:42][C:33]([CH3:52])([CH3:32])[O:34]4)=[CH:39][C:9]=3[CH:10]=2)=[CH:22][CH:21]=1)[CH3:20]

参加物

9

反応物 4

HCID 24287Tin tetrachlorideHCID 158872882,2-Dimethyl-4(tol4-yl)-chrom-3-en-6-al2 回HCID 57037360Ethyl 4-(diethoxyphosphoryl-3,3-dimethoxypropyl)benzoate2 回HCID 178418339Butyllithium

生成物 1

HCID 9933376Ethyl 4-[2,2-dimethyl-4-(tol-4-yl)-benzo(1,2-g)-chrom-3-en-7-yl]benzoate

試薬・触媒・溶媒 4

HCID 6344Dichloromethane溶媒2 回HCID 8028Tetrahydrofuran溶媒2 回HCID 8058Hexane溶媒HCID 8857Ethyl Acetate溶媒

実験手順

To a cold (-78° C.) solution of ethyl 4-(diethoxyphosphoryl-3,3-dimethoxypropyl)benzoate (Compound D, 1.4 g, 3.6 mmol) in THF (9 mL) was added n-BuLi in hexane (1.6 M solution, 2.8 mL). The mixture was gradually warmed to ambient temperature over 30 minutes and stirred for 5 minutes. To this mixture was added 2,2-dimethyl-4(tol-4-yl)-chrom-3-en-6-al (Compound Q, 260 mg, 0.93 mmol) in THF (1 mL) at ambient temperature and the mixture was stirred for 5 hours. The reaction mixture was diluted with ethyl acetate (100 mL) and washed with brine (10 mL) dried and the solvent was removed by evaporation. The residual material was subjected to flash chromatography on silicagel to obtain the E and Z olefinic compounds, which were dissolved in dichloromethane (5 mL) and cooled to -50° C. A solution of SnCl4 in dichloromethane (150 mg in 0.7 mL) was added to the olefinic compounds. The reaction mixture was gradually warmed to -10° C. over 3 hours and then quenched with methanol and water. The reaction mixture was diluted with ethyl acetate (100 mL). The organic layer was washed with brine and dried. Solvent was removed under reduced pressure and the residue purified by chromatography on silicagel to afford the title compound as a white solid.

後処理

  1. stirringthe mixture was stirred for 5 hours
  2. washwashed with brine (10 mL)
  3. customdried
  4. customthe solvent was removed by evaporation
  5. customto obtain the E and Z olefinic compounds, which
  6. temperaturecooled to -50° C
  7. temperatureThe reaction mixture was gradually warmed to -10° C. over 3 hours
  8. customquenched with methanol and water
  9. additionThe reaction mixture was diluted with ethyl acetate (100 mL)
  10. washThe organic layer was washed with brine
  11. customdried
  12. customSolvent was removed under reduced pressure
  13. customthe residue purified by chromatography on silicagel

出典と根拠

ORDレコード
ord-0edf663589224cd8b8d21033b5a4eaf0
出典データセット
uspto-grants-2000_07
特許番号
US06087505

関連ノート

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