Methylparaben → Methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoate

HRID 350498노트

반응식

HRID 350498 반응식
[C:1]([O:5][C:6]([N:8]1[CH2:12][C:11]([F:14])([F:13])[CH2:10][CH:9]1[CH2:15][OH:16])=[O:7])([CH3:4])([CH3:3])[CH3:2].O[C:18]1[CH:27]=[CH:26][C:21]([C:22]([O:24][CH3:25])=[O:23])=[CH:20][CH:19]=1.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1>[C:1]([O:5][C:6]([N:8]1[CH2:12][C:11]([F:13])([F:14])[CH2:10][CH:9]1[CH2:15][O:16][C:18]1[CH:27]=[CH:26][C:21]([C:22]([O:24][CH3:25])=[O:23])=[CH:20][CH:19]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

참가 물질

6

반응물 4

HCID 7456MethylparabenHCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 22001352Tert-butyl 4,4-difluoro-2-(hydroxymethyl)pyrrolidine-1-carboxylate

생성물 1

HCID 69332927Methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoate수율 88.4%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

실험 절차

To a stirred mixture of 1-(tert-butoxycarbonyl)-4,4difluoro-2-pyrrolidinylmethanol (600 mg, 2.53 mmol), methyl 4-hydroxybenzoate (462 mg, 3.03 mmol), Ph3P (795 mg, 3.03 mmol) in THF (10 ml) was added DIAD (597 ul, 3.03 mmol) at room temperature. The mixture was heated at reflux for 3 h with stirring. After cooling to room temperature, the mixture was concntrated in vacuo. The residue was chromatographed on silica gel with hexane-EtOAc (4:1) as eluent to give methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoate (831 mg, 88%) as a colorless oil. 1H-NMR (CDCl3) δ 1.48 (s, 9 H), 2.53–2.61 (m, 2 H), 3.63–4.41 (series of m, total 8 H), 6.94 (d, J=8.8 Hz, 2H), 7.99(d, J=8.8 Hz, 2H).

후처리

  1. temperatureThe mixture was heated
  2. temperatureat reflux for 3 h
  3. customThe residue was chromatographed on silica gel with hexane-EtOAc (4:1) as eluent

출처 및 근거

ORD 기록
ord-b5b8c9b3af584504b4cd88d3d79147c4
출처 데이터셋
uspto-grants-2007_02
특허 번호
US07179819B2

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