p-Toluenesulfonic acid → Methyl (4E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxo-5-isobenzofuranyl)-4-methyl-4-hexenoate

HRID 1721652

反応式

HRID 1721652 の反応式
[OH:1][C:2]1[C:10]([CH2:11]/[CH:12]=[C:13](\[CH3:19])/[CH2:14][CH2:15][C:16]([OH:18])=[O:17])=[C:9]([O:20][CH3:21])[C:8]([CH3:22])=[C:7]2[C:3]=1[C:4](=[O:23])[O:5][CH2:6]2.[C:24]1(C)C=CC(S(O)(=O)=O)=CC=1>CO>[OH:1][C:2]1[C:10]([CH2:11]/[CH:12]=[C:13](\[CH3:19])/[CH2:14][CH2:15][C:16]([O:18][CH3:24])=[O:17])=[C:9]([O:20][CH3:21])[C:8]([CH3:22])=[C:7]2[C:3]=1[C:4](=[O:23])[O:5][CH2:6]2

参加物

4

反応物 2

HCID 6101p-Toluenesulfonic acidHCID 446541Mycophenolic Acid

生成物 1

HCID 6478685Methyl (4E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxo-5-isobenzofuranyl)-4-methyl-4-hexenoate収率 1,243.2%

試薬・触媒・溶媒 1

HCID 887Methanol溶媒

実験手順

A solution of 15.1 g (47.1 mmol) of (E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxoisobenzofuran-5-yl)-4-methyl-4-hexenoic acid (mycophenolic acid) and 0.7 g (3.7 mmol) of p-toluenesulfonic acid in 400 ml of methanol was allowed to stand at room temperature for 3 days. The mixture was concentrated under reduced pressure to approximately 75 ml and then partitioned between aqueous sodium bicarbonate and ethyl acetate. The organic phase was further washed with brine and then dried over sodium sulfate. Concentration of the organic phase under reduced pressure gave 15.4 g (46.0 mmol, 98%) of methyl (E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxoisobenzofuran-5-yl)-4-methyl-4-hexenoate as a white solid, mp 104°-105° C.

後処理

  1. concentrationThe mixture was concentrated under reduced pressure to approximately 75 ml
  2. custompartitioned between aqueous sodium bicarbonate and ethyl acetate
  3. washThe organic phase was further washed with brine
  4. dry with materialdried over sodium sulfate

出典と根拠

ORDレコード
ord-cd5a460ab0774e4c99b345f544b78588
出典データセット
uspto-grants-1996_04
特許番号
US05512568

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