(R)-(2-Iodo-1-methyl-ethyl)-carbamic acid benzyl ester → (R)-(1-Methyl-pent-4-enyl)-carbamic acid benzyl ester

HRID 229800ノート

反応式

HRID 229800 の反応式
[CH2:1]([Mg]Cl)[CH:2]=[CH2:3].[CH2:6]([O:13][C:14](=[O:20])[NH:15][C@H:16]([CH3:19])[CH2:17]I)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1>C1COCC1.CSC.[Cu]Br>[CH2:6]([O:13][C:14](=[O:20])[NH:15][C@H:16]([CH3:19])[CH2:17][CH2:3][CH:2]=[CH2:1])[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1

参加物

5

反応物 2

HCID 11631115(R)-(2-Iodo-1-methyl-ethyl)-carbamic acid benzyl esterHCID 178418473HCID 178418473、化合物

生成物 1

HCID 11107239(R)-(1-Methyl-pent-4-enyl)-carbamic acid benzyl ester

試薬・触媒・溶媒 2

HCID 2724234Bromo(thiobis(methane))copper触媒HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
-78 °C

実験手順

Copper (I) bromide-dimethyl sulfide (1.93 g, 9.4 mmol) was dissolved in distilled THF (24 ml), then was cooled to −78 degrees C. A solution of allyl magnesium chloride (9.4 ml, 2M in THF, Aldrich) was added dropwise, then the solution was stirred for 30 minutes. ((R)-2-Iodo-1-methyl-ethyl)-carbamic acid benzyl ester (1.5 g, 4.7 mmol) in distilled THF (3 ml) was added dropwise, then the reaction was warmed to −40 degrees C. and was stirred for 2.5 h. The reaction mixture was quenched with aq. sat. NH4Cl (4 ml) at −40 degrees C., warmed to RT and the gray reaction mixture turned sky blue. THF was removed in vacuo. Then, Et2O was added and the reaction mixture was filtered to remove precipitated solids. The solids were washed with additional Et2O. The combined organics were extracted with 10% NH4OH (3×), then brine. The combined organics were dried with MgSO4, filtered, concentrated in vacuo, then filtered through a plug of silica gel washing with 20% EtOAc/hexanes (100 ml). The solution was concentrated in vacuo, then the resultant colorless oil was used in the next reaction without further purification (0.8 g, 73%).

後処理

  1. temperaturethe reaction was warmed to −40 degrees C
  2. stirringand was stirred for 2.5 h
  3. customThe reaction mixture was quenched with aq. sat. NH4Cl (4 ml) at −40 degrees C
  4. temperature, warmed to RT
  5. customTHF was removed in vacuo
  6. additionThen, Et2O was added
  7. filtrationthe reaction mixture was filtered
  8. customto remove
  9. customprecipitated solids
  10. washThe solids were washed with additional Et2O
  11. extractionThe combined organics were extracted with 10% NH4OH (3×)
  12. dry with materialThe combined organics were dried with MgSO4
  13. filtrationfiltered
  14. concentrationconcentrated in vacuo
  15. filtrationfiltered through a plug of silica gel washing with 20% EtOAc/hexanes (100 ml)
  16. concentrationThe solution was concentrated in vacuo
  17. customthe resultant colorless oil was used in the next reaction without further purification (0.8 g, 73%)

出典と根拠

ORDレコード
ord-26157d8fa27c4c6a9339a1bf521a7b8b
出典データセット
uspto-grants-2009_07
特許番号
US07563784B2

反応ノート

読み込み中…