Triphenylphosphine → Methyl 4-(4-chromanoyloxy)-2-methoxybenzoate

HRID 1682

反応式

HRID 1682 の反応式
[OH:1][C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([O:12][CH3:13])[CH:3]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[O:33]1[C:42]2[C:37](=[CH:38][CH:39]=[CH:40][CH:41]=2)[CH:36](O)[CH2:35][CH2:34]1.N(C(OCC)=O)=N[C:46](OCC)=[O:47]>C1COCC1>[O:33]1[C:42]2[C:37](=[CH:38][CH:39]=[CH:40][CH:41]=2)[CH:36]([C:46]([O:1][C:2]2[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([O:12][CH3:13])[CH:3]=2)=[O:47])[CH2:35][CH2:34]1

参加物

6

反応物 4

HCID 11776TriphenylphosphineHCID 92890Chroman-4-olHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 12532676Methyl 4-hydroxy-2-methoxybenzoate

生成物 1

HCID 19691018Methyl 4-(4-chromanoyloxy)-2-methoxybenzoate

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
0 °C

実験手順

To a stirred solution of methyl 4-hydroxy-2-methoxybenzoate (364 mg, 2.0 mmol) in dry THF (1.25 mL) was added triphenylphosphine (525 mg, 2.0 mmol) and the solution was cooled to 0° C. A 500 mL volume of 4-chromanol (200 mg, 1.33 mmol) and diethyl azodicarboxylate (315 mL, 2.0 mmol) in THF was added dropwise via syringe over 0.5 h. The reaction was filtered and the solvent was removed under reduced pressure. The residue was chromatographed on a silica gel column packed in 92:8 hexanes:EtOAc and eluted with same. The appropriate fractions were combined and the solvent removed under reduced pressure to afford methyl 4-(4-chromanoyloxy)-2-methoxybenzoate.

後処理

  1. filtrationThe reaction was filtered
  2. customthe solvent was removed under reduced pressure
  3. customThe residue was chromatographed on a silica gel column
  4. washEtOAc and eluted with same
  5. customthe solvent removed under reduced pressure

出典と根拠

ORDレコード
ord-c76a22e184294ef893b6fc5df9e611d7
出典データセット
uspto-grants-1998_03
特許番号
US05726172

関連ノート

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