Diethyl 2-(ethoxymethylidene)-3-oxobutanedioate → Triethyl 1,6-dihydro-6-oxo-2,3,5-pyridinetricarboxylate

HRID 742209

反応式

HRID 742209 の反応式
C([CH:3]([C:7]([NH2:9])=[O:8])[C:4]([O-:6])=[O:5])C.C(O[CH:13]=[C:14]([C:20]([C:22]([O:24][CH2:25][CH3:26])=[O:23])=O)[C:15]([O:17][CH2:18][CH3:19])=[O:16])C.[C:27]([O-])(=O)[CH3:28].[Na+]>C(O)C>[CH2:25]([O:24][C:22]([C:20]1[NH:9][C:7](=[O:8])[C:3]([C:4]([O:6][CH2:27][CH3:28])=[O:5])=[CH:13][C:14]=1[C:15]([O:17][CH2:18][CH3:19])=[O:16])=[O:23])[CH3:26]

参加物

5

反応物 3

HCID 40590Diethyl 2-(ethoxymethylidene)-3-oxobutanedioateHCID 517045Sodium AcetateHCID 21894451Ethylmalonamate

生成物 1

HCID 19958207Triethyl 1,6-dihydro-6-oxo-2,3,5-pyridinetricarboxylate収率 80.3%

試薬・触媒・溶媒 1

HCID 702Ethanol溶媒2 回

反応条件

温度
0 °C

実験手順

A solution of ethylmalonamate (23.6 g, 0.18 mol) in absolute ethanol (300 mL) is added to a stirred solution of diethyl ethoxymethyleneoxalacetate (44.0 g, 0.18 mol) in ethanol (200 mL) at 0° C., followed by the addition of solid sodium acetate (14.72 g, 0.18 mol). After stirring for ten minutes at 0° C., the mixture is heated to reflux and stirred for 13.5 hours. After cooling, the ethanol is removed under vacuum, and the residue diluted with water and acidified co pH 2 with concentrated hydrochloric acid. The aqueous solution is extracted with methylene chloride (2×200 mL) and the organic layer washed with 300 mL saturated sodium chloride, then dried over anhydrous magnesium sulfate and concentrated in vacuum to give 45.0 g of the title product as an orange oil.

後処理

  1. temperaturethe mixture is heated
  2. temperatureto reflux
  3. stirringstirred for 13.5 hours
  4. temperatureAfter cooling
  5. customthe ethanol is removed under vacuum
  6. additionthe residue diluted with water
  7. extractionThe aqueous solution is extracted with methylene chloride (2×200 mL)
  8. washthe organic layer washed with 300 mL saturated sodium chloride
  9. dry with materialdried over anhydrous magnesium sulfate
  10. concentrationconcentrated in vacuum

出典と根拠

ORDレコード
ord-efbaab2ebdd047b2a926ccdcd794ff5e
出典データセット
uspto-grants-1996_09
特許番号
US05554579

関連ノート

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