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Lithium Hexamethyldisilazide → (R)-3-((S)-2-(4-fluoro-3,5-dimethylbenzyl)-6-(4-fluoro-3-methylbenzyloxy)hexanoyl)-4-benzyloxazolidin-2-one

HRID 1158134
ノート
印刷プレビュー

反応式

HRID 1158134 の反応式
[F:1][C:2]1[CH:29]=[CH:28][C:5]([CH2:6][O:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][C:13]([N:15]2[C@H:19]([CH2:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)[CH2:18][O:17][C:16]2=[O:27])=[O:14])=[CH:4][C:3]=1[CH3:30].[Li+].C[Si]([N-][Si](C)(C)C)(C)C.[CH3:41][C:42]1[CH:43]=[C:44]([CH:47]=[C:48]([CH3:51])[C:49]=1[F:50])[CH2:45]Br>C1COCC1>[F:50][C:49]1[C:48]([CH3:51])=[CH:47][C:44]([CH2:45][C@H:12]([CH2:11][CH2:10][CH2:9][CH2:8][O:7][CH2:6][C:5]2[CH:28]=[CH:29][C:2]([F:1])=[C:3]([CH3:30])[CH:4]=2)[C:13]([N:15]2[C@H:19]([CH2:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)[CH2:18][O:17][C:16]2=[O:27])=[O:14])=[CH:43][C:42]=1[CH3:41]
参加物反応条件実験手順後処理出典と根拠反応ノート

参加物

5

反応物 3

HCID 2733832Lithium HexamethyldisilazideHCID 177507135-(Bromomethyl)-2-fluoro-1,3-dimethylbenzeneHCID 59512592(R)-3-(6-(4-fluoro-3-methylbenzyloxy)hexanoyl)-4-benzyloxazolidin-2-one

生成物 1

HCID 59512593(R)-3-((S)-2-(4-fluoro-3,5-dimethylbenzyl)-6-(4-fluoro-3-methylbenzyloxy)hexanoyl)-4-benzyloxazolidin-2-one収率 36.3%

試薬・触媒・溶媒 1

HCID 8028
Tetrahydrofuran
溶媒
2 回

反応条件

温度
-78 °C

実験手順

To a cooled (−78° C.) solution of (R)-3-(6-(4-fluoro-3-methylbenzyloxy)hexanoyl)-4-benzyloxazolidin-2-one (0.220 g, 0.532 mmol) in 5 mL of THF, was added LiHMDS (0.80 mL, 0.80 mmol, 1.0 M in THF). The resulting mixture was stirred at −78° C. under N2 for 1 h and then a solution of 3,5-dimethyl-4-fluorobenzyl bromide (0.346 g, 1.596 mmol) in 3 mL of THF was added. After stirring at −78° C. for 1 h the reaction mixture was warmed to room temperature for 2 h, and then quenched with 20 mL of NH4Cl solution and extracted with dichloromethane (20 mL×3). The combined organic extracts were dried (Na2SO4), filtered, and concentrated under reduced pressure. The product was isolated by Flash column chromatography (silica gel column) eluting with 0-100% dichloromethane/hexanes to give the title compound as colorless oil (0.106 g, 36% yield). GC-MS: tR=15.6 min; m/z 549 (M+).

後処理

  1. stirringAfter stirring at −78° C. for 1 h the reaction mixture
  2. temperaturewas warmed to room temperature for 2 h
  3. customquenched with 20 mL of NH4Cl solution
  4. extractionextracted with dichloromethane (20 mL×3)
  5. dry with materialThe combined organic extracts were dried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe product was isolated by Flash column chromatography (silica gel column)
  9. washeluting with 0-100% dichloromethane/hexanes

出典と根拠

ORDレコード
ord-a491f174b7ee4f6b9405241b3efff509
出典データセット
uspto-grants-2010_10
DOI
10.6084/m9.figshare.5104873.v1
特許番号
US07807720B2

反応ノート

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