Ethyl 4-bromobenzoate → Ethyl 4-(diethoxyphosphoryl)benzoate

HRID 719246

反応式

HRID 719246 の反応式
[CH2:1]([O:3][C:4](=[O:12])[C:5]1[CH:10]=[CH:9][C:8](Br)=[CH:7][CH:6]=1)[CH3:2].[P:13]([O-:20])([O:17][CH2:18][CH3:19])[O:14][CH2:15][CH3:16]>C(#N)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CN1CCOCC1>[CH2:1]([O:3][C:4](=[O:12])[C:5]1[CH:10]=[CH:9][C:8]([P:13]([O:17][CH2:18][CH3:19])([O:14][CH2:15][CH3:16])=[O:20])=[CH:7][CH:6]=1)[CH3:2]

参加物

6

反応物 2

HCID 22043Ethyl 4-bromobenzoateHCID 3780918Diethylphosphite

生成物 1

HCID 2773693Ethyl 4-(diethoxyphosphoryl)benzoate収率 67.9%

試薬・触媒・溶媒 3

HCID 79724-Methylmorpholine触媒HCID 178418397HCID 178418397、化合物触媒HCID 6342Acetonitrile溶媒

実験手順

A sealed pressure flask, flushed with N2, containing a mixture of 4-bromo-benzoic acid ethyl ester (2a) (5 g, 0.0218 mol), diethyl phosphite (3.093 mL, 0.024 mol), NMM (2.88 mL, 0.0262 mmol) and Pd(PPh3)4 (2.017 g, 0.00175 mol) in acetonitrile (20 mL) was stirred at ambient temperature for 5–10 min, then heated at 90° C. for 18 hours. The reaction mixture was filtered through celite, and the celite was washed with EtOAc (3×30 mL) until the filtrate showed little or no evidence of product by HPLC. The combined organics were dried over Na2SO4 and concentrated on a rotary evaporator. The desired product was purified by silica gel flash chromatography to give a pale yellow oil (4.24 g). 1H NMR (300 MHz, CDCl3) δ(ppm)) 1.36 (m, 6H), 1.42 (t, J=7 Hz, 3H), 4.16 (m, 4H), 4.42 (q, J=7 Hz, 2H), 7.93 (m, 2H), 8.15 (m, 2H). 31P NMR (121 MHz, CDCl3) δ 17.63.

後処理

  1. customA sealed pressure flask, flushed with N2
  2. additioncontaining
  3. temperatureheated at 90° C. for 18 hours
  4. filtrationThe reaction mixture was filtered through celite
  5. washthe celite was washed with EtOAc (3×30 mL) until the filtrate
  6. dry with materialThe combined organics were dried over Na2SO4
  7. concentrationconcentrated on a rotary evaporator
  8. customThe desired product was purified by silica gel flash chromatography

出典と根拠

ORDレコード
ord-3064727042e44329b252a2bcc36b12cb
出典データセット
uspto-grants-2006_11
特許番号
US07132427B2

関連ノート

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