Lithium borohydride → 5-Ethyl-6-(4-hydroxy-3-methyl-but-2-enyl)4-methyl-7-(2-trimethylsilanyl-ethoxy)-3H-isobenzofuran-1-one

HRID 540717ノート

反応式

HRID 540717 の反応式
[CH2:1]([C:3]1[C:11]([CH3:12])=[C:10]2[C:6]([C:7](=[O:13])[O:8][CH2:9]2)=[C:5]([O:14][CH2:15][CH2:16][Si:17]([CH3:20])([CH3:19])[CH3:18])[C:4]=1[CH2:21][CH:22]=[C:23]([CH3:26])[CH:24]=[O:25])[CH3:2].[BH4-].[Li+]>CO.CO.O.C1COCC1>[CH2:1]([C:3]1[C:11]([CH3:12])=[C:10]2[C:6](=[C:5]([O:14][CH2:15][CH2:16][Si:17]([CH3:18])([CH3:19])[CH3:20])[C:4]=1[CH2:21][CH:22]=[C:23]([CH3:26])[CH2:24][OH:25])[C:7](=[O:13])[O:8][CH2:9]2)[CH3:2]

参加物

6

反応物 2

HCID 4148881Lithium borohydrideHCID 725636044-[6-Ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enal

生成物 1

HCID 670098805-Ethyl-6-(4-hydroxy-3-methyl-but-2-enyl)4-methyl-7-(2-trimethylsilanyl-ethoxy)-3H-isobenzofuran-1-one収率 73.4%

試薬・触媒・溶媒 3

HCID 887Methanol溶媒HCID 8028Tetrahydrofuran溶媒HCID 22242641Methanol--water (1/1)溶媒

反応条件

温度
0 °C

実験手順

4-[6-Ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enal (77.6 mg, 0.207 mmol) was dissolved in MeOH (4 mL). A solution of CeCl3 (51.1 mg, 0.207 mmol) in MeOH/water (9/1, 0.66 mL) was added and the solution was cooled to 0° C. A solution of lithium borohydride in THF (2M, 0.105 mL) was added dropwise. After 15 minutes, the reaction was quenched with 1N HCl (0.5 mL). The MeOH was removed in vacuo and the crude material was partitioned between DCM and water. The aqueous layer was extracted with DCM and the combined organic layers were washed with sodium bicarbonate solution and dried over sodium sulfate. Filtration and evaporation of solvents yielded a crude oil, which was purified by silica gel chromatography to provide 57.2 mg (73%) of the desired product. 1H NMR (300 MHz, CDCl3): δ=0.04 (s, 9H), 1.15 (t, J=7.8 Hz, 3H), 1.26 (m, 2H), 1.86 (s, 3H), 2.19 (s, 3H), 2.72 (q, J=7.8 Hz, 2H), 3.52 (d, J=6.3 Hz, 2H), 3.99 (s, 2H), 4.34 (m, 2H), 5.14 (s, 2H), 5.32 (m, 1H) ppm.

後処理

  1. customthe reaction was quenched with 1N HCl (0.5 mL)
  2. customThe MeOH was removed in vacuo
  3. customthe crude material was partitioned between DCM and water
  4. extractionThe aqueous layer was extracted with DCM
  5. washthe combined organic layers were washed with sodium bicarbonate solution
  6. dry with materialdried over sodium sulfate
  7. filtrationFiltration and evaporation of solvents
  8. customyielded a crude oil, which
  9. customwas purified by silica gel chromatography

出典と根拠

ORDレコード
ord-01df3f7f4ef74c87b8e79b0ebcc3cf5d
出典データセット
uspto-grants-2014_10
特許番号
US08871785B2

反応ノート

読み込み中…