Tributyltin Chloride → Tert-butyl 2-tributylstannanylethynylpyrrolidine-1-carboxylate

HRID 715975

反応式

HRID 715975 の反応式
C([Li])CCC.[C:6]([CH:8]1[CH2:12][CH2:11][CH2:10][N:9]1[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])#[CH:7].[CH2:20]([Sn:24](Cl)([CH2:29][CH2:30][CH2:31][CH3:32])[CH2:25][CH2:26][CH2:27][CH3:28])[CH2:21][CH2:22][CH3:23]>C1COCC1>[CH2:29]([Sn:24]([CH2:20][CH2:21][CH2:22][CH3:23])([CH2:25][CH2:26][CH2:27][CH3:28])[C:7]#[C:6][CH:8]1[CH2:12][CH2:11][CH2:10][N:9]1[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:30][CH2:31][CH3:32]

参加物

5

反応物 3

HCID 15096Tributyltin ChlorideHCID 14730283tert-Butyl 2-ethynylpyrrolidine-1-carboxylateHCID 178418339Butyllithium

生成物 1

HCID 70984584Tert-butyl 2-tributylstannanylethynylpyrrolidine-1-carboxylate収率 61.2%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

反応条件

温度
-30 °C

実験手順

n-Butyllithium (1.6M in hexanes, 12.3 mL) was added over 2 minutes to a stirred solution of tert-butyl 2-ethynylpyrrolidine-1-carboxylate (3.65 g) in anhydrous THF (80 mL) at −78° C. under nitrogen and then the mixture was allowed to warm to −30° C. over one hour. Tributyltin chloride (6.41 g) was then added dropwise at −30° C. and the mixture was allowed to warm to −10° C. and quenched by addition of saturated sodium bicarbonate solution. The layers were separated and the organic layer was dried (Na2SO4) and filtered. The filtrate was concentrated in vacuo and the residue was purified by chromatography on silica, eluting with a mixture of ethyl acetate and cyclohexane with a gradient of 0-5% to give tert-butyl 2-tributylstannanylethynylpyrrolidine-1-carboxylate (5.54 g) as a colourless oil.

後処理

  1. temperatureto warm to −10° C.
  2. customquenched by addition of saturated sodium bicarbonate solution
  3. customThe layers were separated
  4. dry with materialthe organic layer was dried (Na2SO4)
  5. filtrationfiltered
  6. concentrationThe filtrate was concentrated in vacuo
  7. customthe residue was purified by chromatography on silica
  8. washeluting with a mixture of ethyl acetate and cyclohexane with a gradient of 0-5%

出典と根拠

ORDレコード
ord-776f43b0be0942e2b951c2f0e804c936
出典データセット
uspto-grants-2015_11
特許番号
US09187494B2

関連ノート

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