Chloroacetonitrile → 5-tert-Butyl-2-(chloromethyl)-1,3-oxazole

HRID 1637242ノート

反応式

HRID 1637242 の反応式
B(F)(F)F.CCOCC.[N+:10](=[CH:12][C:13](=[O:18])[C:14]([CH3:17])([CH3:16])[CH3:15])=[N-].C(=O)(O)[O-].[Na+].[Cl:24][CH2:25][C:26]#N>>[Cl:24][CH2:25][C:26]1[O:18][C:13]([C:14]([CH3:17])([CH3:16])[CH3:15])=[CH:12][N:10]=1

参加物

5

反応物 4

HCID 7856Chloroacetonitrile2 回HCID 8000Boron trifluoride etherateHCID 516892Sodium BicarbonateHCID 217927841-Diazonio-3,3-dimethylbut-1-en-2-olate

生成物 1

HCID 129689745-tert-Butyl-2-(chloromethyl)-1,3-oxazole

反応条件

温度
0 °C

実験手順

To a solution of 2 mL (2.3 g, 16 mmol) of boron trifluoride etherate in 20 mL of chloroacetonitrile at 0° C. was added a solution of 1.33 g (10 mmol) of 1-diazo-3,3-dimethyl-2-butanone in 5 mL of chloroacetonitrile dropwise. The resulting solution was stirred at 0° C. for 0.5 h. The reaction mixture was added to saturated aqueous sodium bicarbonate solution to neutralize the acid and the product was extracted three times with dichloromethane. The combined extracts was dried (sodium sulfate), concentrated and purified by flash column chromatography (Merck silic a, 25×200 mm, dichloromethane) to give 1.1 g of 2-(chloromethyl)-5-t-butyloxazole as a yellow liquid (6.4 mmol, 64% overall from the acid chloride). 1H NMR δ (CDCl3): 1.30 (s, 9 H), 4.58 (s, 2 H), 6.68 (s, 1 H); MS 174 (M+H)+ ; TLC: Rf (silica gel, dichloromethane)=0.33;

後処理

  1. extractionthe product was extracted three times with dichloromethane
  2. dry with materialThe combined extracts was dried (sodium sulfate)
  3. concentrationconcentrated
  4. custompurified by flash column chromatography (Merck silic a, 25×200 mm, dichloromethane)

出典と根拠

ORDレコード
ord-6f2935a5bbef4f7e98166bd61f753e15
出典データセット
uspto-grants-2000_03
特許番号
US06040321

反応ノート

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