Methyl iodide → Methyl 2-(3-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propanoate

HRID 1930139ノート

反応式

HRID 1930139 の反応式
C[Si]([N-][Si](C)(C)C)(C)C.[Li+].[Cl:11][C:12]1[CH:13]=[C:14]([CH2:27][C:28]([O:30][CH3:31])=[O:29])[CH:15]=[CH:16][C:17]=1[B:18]1[O:22][C:21]([CH3:24])([CH3:23])[C:20]([CH3:26])([CH3:25])[O:19]1.[CH3:32]I.[Cl-].[NH4+]>C1COCC1.O.C(OCC)(=O)C>[Cl:11][C:12]1[CH:13]=[C:14]([CH:27]([CH3:32])[C:28]([O:30][CH3:31])=[O:29])[CH:15]=[CH:16][C:17]=1[B:18]1[O:22][C:21]([CH3:23])([CH3:24])[C:20]([CH3:25])([CH3:26])[O:19]1

参加物

8

反応物 4

HCID 6328Methyl iodideHCID 25517Ammonium ChlorideHCID 2733832Lithium HexamethyldisilazideHCID 58464478Benzeneacetic acid, 3-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-, methyl ester2 回

生成物 1

HCID 59627648Methyl 2-(3-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propanoate収率 56.1%

試薬・触媒・溶媒 3

HCID 962Water溶媒HCID 8028Tetrahydrofuran溶媒HCID 8857Ethyl Acetate溶媒

反応条件

温度
0 °C

実験手順

Lithium bis(trimethylsilyl)amide (7.79 mL, 7.79 mmol) was added to methyl 2-(3-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate (Intermediate 2-7; 2.2 g, 7.08 mmol) in THF (50 mL) cooled to 0° C. under nitrogen. The resulting solution was stirred at 0° C. for 30 minutes. Next methyl iodide (0.530 mL, 8.50 mmol) was added and the reaction stirred for 30 minutes Ammonium chloride (satd) (50 mL) was added with vigorous stirring, ethyl acetate (100 mL) and water (50 mL) were added and the organic phase separated, washed with water (50 mL) and saturated brine (50 mL). The organic layer was dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 0 to 40% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford methyl 2-(3-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propanoate (1.290 g, 56.1%) as a colourless oil.

後処理

  1. additionwere added
  2. customthe organic phase separated
  3. washwashed with water (50 mL) and saturated brine (50 mL)
  4. dry with materialThe organic layer was dried over MgSO4
  5. filtrationfiltered
  6. customevaporated
  7. customto afford crude product
  8. customThe crude product was purified by flash silica chromatography, elution gradient 0 to 40% EtOAc in isohexane
  9. customPure fractions were evaporated to dryness

出典と根拠

ORDレコード
ord-dd314a89ba3d4660bbbbdcedff6c372b
出典データセット
uspto-grants-2012_05
特許番号
US08188092B2

反応ノート

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