2,6-Dibromopyridine → n-[1-Eth-(z)-ylidene-5,5-dimethoxy-2-oxo-pentyl]acrylimidoyl bromide

HRID 29082

反応式

HRID 29082 の反応式
Br[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Br:8])[N:3]=1.[Li][CH2:10]CCC.[CH3:14][O:15][CH:16]([O:25][CH3:26])[CH2:17][CH2:18][C:19](N(OC)C)=[O:20]>CCOCC>[CH:7](=[C:2](/[N:3]=[C:4]([Br:8])[CH:5]=[CH2:10])\[C:19](=[O:20])[CH2:18][CH2:17][CH:16]([O:15][CH3:14])[O:25][CH3:26])/[CH3:6]

参加物

5

反応物 3

HCID 122742,6-DibromopyridineHCID 597880834,4,N-Trimethoxy-N-methylbutyramideHCID 178418339Butyllithium

生成物 1

HCID 87233323n-[1-Eth-(z)-ylidene-5,5-dimethoxy-2-oxo-pentyl]acrylimidoyl bromide収率 74.9%

試薬・触媒・溶媒 1

HCID 3283Diethyl Ether溶媒

反応条件

温度
-70 °C

実験手順

To a suspension of 2,6-dibromopyridine(8.1 g, 34.03 mmol) in 80 mL of ether at −70° C., is added BuLi(12.3 mL, 26.17 mmol, 2.5 M in Hexane) in on portion. After stirring at −70° C. for 5 min, 4,4,N-Trimethoxy-N-methyl-butyramide(5.0 g, 26.17 mmol) is added to the solution dropwise. After stirring at −70° C. for 1.5 hr, the reaction mixture is quenched with 120 mL of water and extracted with 3×130 mL of EtOAc. The combined organic layers is concentrated and purified by chromatography(Hexane/EtOAc:70/30) to give N-[1-Eth-(Z)-ylidene-5,5-dimethoxy-2-oxo-pentyl]-acrylimidoyl bromide(5.96 g, 60.5%) as light yellow liquid. M/Z=288.0

後処理

  1. stirringAfter stirring at −70° C. for 1.5 hr
  2. customthe reaction mixture is quenched with 120 mL of water
  3. extractionextracted with 3×130 mL of EtOAc
  4. concentrationThe combined organic layers is concentrated
  5. custompurified by chromatography(Hexane/EtOAc:70/30)

出典と根拠

ORDレコード
ord-4fd606995a9a445d89b0c7983409a85d
出典データセット
uspto-grants-2008_09
特許番号
US07419975B2

関連ノート

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