Benzyl Alcohol → 2-Fluorobenzoic acid, benzyl ester

HRID 971177

반응식

HRID 971177 반응식
[CH2:1]([OH:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[F:9][C:10]1[CH:18]=[CH:17][CH:16]=[CH:15][C:11]=1[C:12](O)=[O:13].C1(N=C=NC2CCCCC2)CCCCC1>CN(C)C1C=CN=CC=1.C(Cl)Cl>[CH2:1]([O:8][C:12](=[O:13])[C:11]1[CH:15]=[CH:16][CH:17]=[CH:18][C:10]=1[F:9])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

참가 물질

6

반응물 3

HCID 244Benzyl AlcoholHCID 99352-Fluorobenzoic acidHCID 10868Dicyclohexylcarbodiimide

생성물 1

HCID 5793312-Fluorobenzoic acid, benzyl ester

시약·촉매·용매 2

HCID 142844-(Dimethylamino)pyridine촉매HCID 6344Dichloromethane용매

실험 절차

Benzyl alcohol (2.60 mL, 25.1 mmol) was added slowly to a stirring solution of 2-fluorobenzoic acid (2.92 g, 20.8 mmol), 4-(dimethylamino)pyridine (251 mg, 2.05 mmol), and 1,3-dicyclohexylcarbodiimide (5.16 g, 25.0 mmol) in anhydrous CH2Cl2 at room temperature under an Ar atmosphere. After 18 h the precipitate was filtered off and washed with CH2Cl2, and the filtrate was concentrated with silica to a powder. Flash chromatographic purification over silica (10% to 20% gradient EtOAc in hexanes) afforded 16 as a clear, colorless liquid (4.20 g, 88%). 1H-NMR (500 MHz, CDCl3) δ 5.39 (s, 2H), 7.14 (ddd, J=1.1, 8.4, 9.5 Hz, 1H), 7.20 (dt, J=1.1, 7.7 Hz, 1H), 7.31-7.36 (m, 1H), 7.37-7.41 (m, 2H), 7.44-7.48 (m, 2H), 7.49-7.55 (m, 1H), 7.96 (dt, J=1.8, 7.3 Hz); 13C-NMR (125 MHz, CDCl3) δ 66.93, 117.0 (d, JC-F=22.1 Hz), 118.7 (d, JC-F=9.6 Hz), 124.0 (d, JC-F=3.8 Hz), 128.1, 128.2, 128.6, 132.2, 134.6 (d, JC-F=9.6 Hz), 135.7, 162.1 (d, JC-F=260 Hz), 164.2 (d, JC-F=3.8 Hz); GC-MS 230 m/z [M]+, C14H11OF2 requires 230.

후처리

  1. filtrationAfter 18 h the precipitate was filtered off
  2. washwashed with CH2Cl2
  3. concentrationthe filtrate was concentrated with silica to a powder
  4. customFlash chromatographic purification over silica (10% to 20% gradient EtOAc in hexanes)

출처 및 근거

ORD 기록
ord-ddd22656f89a43aa8232f91cf65698b3
출처 데이터셋
uspto-grants-2007_12
특허 번호
US07312361B2

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