Diethyl Ether → Tert-butyl 2-(6-chloro-5-(trifluoromethyl)pyridin-3-yl)acetate

HRID 592205ノート

反応式

HRID 592205 の反応式
Br[C:2]1[CH:3]=[C:4]([C:9]([F:12])([F:11])[F:10])[C:5]([Cl:8])=[N:6][CH:7]=1.[Cl-].[C:14]([O:18][C:19](=[O:22])[CH2:20][Zn+])([CH3:17])([CH3:16])[CH3:15].CCOCC>C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].CC(P(C(C)(C)C)[C-]1C=CC=C1)(C)C.C1C=CC([C-]2C(C3C=CC=CC=3)=C(C3C=CC=CC=3)C(C3C=CC=CC=3)=C2C2C=CC=CC=2)=CC=1.[Fe+2].C1COCC1>[Cl:8][C:5]1[N:6]=[CH:7][C:2]([CH2:20][C:19]([O:18][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:22])=[CH:3][C:4]=1[C:9]([F:12])([F:11])[F:10]

参加物

7

反応物 3

HCID 3283Diethyl EtherHCID 218363025-Bromo-2-chloro-3-(trifluoromethyl)pyridineHCID 178451183HCID 178451183、化合物

生成物 1

HCID 86657956Tert-butyl 2-(6-chloro-5-(trifluoromethyl)pyridin-3-yl)acetate

試薬・触媒・溶媒 3

HCID 6505921(1E,4E)-1,5-diphenylpenta-1,4-dien-3-one; palladium触媒HCID 129828017Ditert-butyl(cyclopenta-2,4-dien-1-yl)phosphane;iron(2+);(2,3,4,5-tetraphenylcyclopenta-1,4-dien-1-yl)benzene触媒HCID 8028Tetrahydrofuran溶媒

反応条件

温度
100 °C

実験手順

To a sealed tube were added 5-bromo-2-chloro-3-(trifluoromethyl)pyridine 189-1 (170 mg, 0.65 mmol), 0.5 M (2-tert-butoxy-2-oxoethyl) zinc(II) chloride 86-5 in ether (1.57 mL, 0.78 mmol), Pd(dba)2 (19 mg, 0.03 mmol), Q-phos (46 mg, 0.06 mmol) and THF (3 mL). The reaction mixture was bubbled with nitrogen for 1 minute and stirred at 100° C. for 1 hour. After cooling to room temperature, all the solvents were evaporated and the residue was redissolved in ethyl acetate, washed with water and brine, dried over Na2SO4 and concentrated to dryness by rotary evaporation. The crude product was purified by silica gel flash chromatography and eluted with 20% ethyl acetate in hexane to give tert-butyl 2-(6-chloro-5-(trifluoromethyl)pyridin-3-yl)acetate 189-3. MS m/z 296.1 (M+1).

後処理

  1. customThe reaction mixture was bubbled with nitrogen for 1 minute
  2. temperatureAfter cooling to room temperature
  3. customall the solvents were evaporated
  4. dissolutionthe residue was redissolved in ethyl acetate
  5. washwashed with water and brine
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated to dryness by rotary evaporation
  8. customThe crude product was purified by silica gel flash chromatography
  9. washeluted with 20% ethyl acetate in hexane

出典と根拠

ORDレコード
ord-fa44e9fe7fbf474f99b4ce12aa1a4d10
出典データセット
uspto-grants-2016_01
特許番号
US09238646B2

反応ノート

読み込み中…