Phenol → 5-Bromo-2-(1-phenoxyethyl)pyridine

HRID 1501110ノート

反応式

HRID 1501110 の反応式
[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]([OH:10])[CH3:9])=[N:6][CH:7]=1.[C:11]1(O)[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OC(C)C)=O)=NC(OC(C)C)=O>O1CCCC1>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]([O:10][C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[CH3:9])=[N:6][CH:7]=1

参加物

6

反応物 4

HCID 996PhenolHCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 426142881-(5-Bromopyridin-2-yl)ethanol

生成物 1

HCID 895810635-Bromo-2-(1-phenoxyethyl)pyridine収率 94.4%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

実験手順

A solution of 1-(5-bromopyridin-2-yl)ethanol (1.0 g, 4.95 mmol), phenol (835 mg, 8.87 mmol), and triphenylphosphine (1.8 g, 6.86 mmol) was stirred in dry tetrahydrofuran (70 mL) at 0° C. under nitrogen atmosphere. To this mixture was added dropwise diisopropyl diazene-1,2-dicarboxylate (1.4 g, 6.92 mmol) over 5 minutes, and the reaction was monitored by thin layer chromatography. After complete disappearance of starting material, the solvent was removed under reduced pressure and the resultant oil was purified by flash column chromatography (hexane/ethyl acetate, 1/1) to give 5-bromo-2-(1-phenoxyethyl)pyridine (1.3 g, 94.4%) as a white solid. LRMS (M+H+) m/z: calcd 278.01. found 278 1H NMR (300 MHz, DMSO) δ 8.60 (d, J=2.1 Hz, 1H), 7.93 (dd, J1=8.4 Hz, J2=2.1 Hz, 1H), 7.41 (d, J=8.4 Hz, 1H), 7.18 (m, 2H), 6.86 (m, 3H), 5.39 (m, 1H), 1.63 (d, J=6.3 Hz, 3H).

後処理

  1. customAfter complete disappearance of starting material, the solvent was removed under reduced pressure
  2. customthe resultant oil was purified by flash column chromatography (hexane/ethyl acetate, 1/1)

出典と根拠

ORDレコード
ord-a5ed972f73114138a8c02eb6836e222c
出典データセット
uspto-grants-2015_12
特許番号
US09206128B2

反応ノート

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