Triethylamine → 4-((tert-Butyl(dimethyl)silyl)oxy)cyclopent-2-en-1-one

HRID 2538

反応式

HRID 2538 の反応式
[OH:1][CH:2]1[CH2:6][C:5](=[O:7])[CH:4]=[CH:3]1.C(N(CC)CC)C.[Si:15](Cl)([C:18]([CH3:21])([CH3:20])[CH3:19])([CH3:17])[CH3:16]>O1CCCC1.CN(C)C1C=CN=CC=1>[O:7]([CH:5]1[CH2:6][C:2](=[O:1])[CH:3]=[CH:4]1)[Si:15]([C:18]([CH3:21])([CH3:20])[CH3:19])([CH3:17])[CH3:16]

参加物

6

反応物 3

HCID 8471TriethylamineHCID 28928tert-Butyldimethylsilyl chlorideHCID 41691604-Hydroxycyclopent-2-en-1-one

生成物 1

HCID 41316994-((tert-Butyl(dimethyl)silyl)oxy)cyclopent-2-en-1-one収率 83.2%

試薬・触媒・溶媒 2

HCID 142844-(Dimethylamino)pyridine触媒HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
0 °C

実験手順

A solution of 4-hydroxy-2-cyclopentenone (191 g, 1.95 mol, prepared in example 1) and triethylamine (430 mL, 3.09 mol) in anhydrous tetrahydrofuran (1L) is treated with 4-dimethylaminopyridine (4.90 g, 40.0 mmol). The solution is cooled to 0° C. and treated portionwise, over 10 minutes, with tert-butyldimethylsilyl chloride (278 g, 1.84 mol) maintaining the temperature at or below 10° C. The reaction is then allowed to stir overnight at room temperature. It is then poured into aqueous HCl (0.5N, 1L). The phases are separated and the aqueous phase is extracted with heptane (2×1L). The organic phase and organic extracts are combined, washed with aqueous HCl (0.5N, 2×500 mL), then 5% sodium bicarbonate (500 mL), then brine (500 mL), dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum (40° C., 20 mmHg) to provide the title compound (325 g). This is purified by Kugelrohr distillation (70°-80° C., 1 mmHg) to provide the title compound (282 g, 72% yield) as a light yellow oil, Rf =0.55, 20% ethyl acetate/hexane, GC retention time is 14.97 minutes; 1H NMR (CDCl3) δ7.48 (dd, J=5.7, 2.4 Hz, 1H), 6.20 (d, J=5.7 Hz, 1H), 4.95-4.99 (m, 1H), 2.72 (dd, J=18.2, 6.0 Hz, 1H), 2.25 (dd, J=18.2, 2.3 Hz, 1H), 0.88 (s, 9H), 0.11 (s, 6H); 13C NMR (CDCl3) δ 206.4, 163.8, 134.4, 70.8, 44.9, 25.7, 25.6, 18.0; IR (neat) νmax 2957, 2931, 2887, 2858, 1725 cm-1 ; MS (EI) m/e (% relative intensity) 212 (M+, 5), 155 (M+ -57,100).

後処理

  1. temperaturemaintaining the temperature at or below 10° C
  2. customThe phases are separated
  3. extractionthe aqueous phase is extracted with heptane (2×1L)
  4. washwashed with aqueous HCl (0.5N, 2×500 mL)
  5. dry with material5% sodium bicarbonate (500 mL), then brine (500 mL), dried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under vacuum (40° C., 20 mmHg)

出典と根拠

ORDレコード
ord-784b63b848274e07b64f901c8865b018
出典データセット
uspto-grants-1998_03
特許番号
US05728899

関連ノート

読み込み中…