Hydrogen Peroxide → Carboxin

HRID 2198791

反応式

HRID 2198791 の反応式
[C:1]([NH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)(=[O:6])[CH2:2][C:3]([CH3:5])=[O:4].[OH-].[Na+].[SH:16][CH2:17][CH2:18]O.OO>>[CH3:5][C:3]1[O:4][CH2:18][CH2:17][S:16][C:2]=1[C:1]([NH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)=[O:6]

参加物

5

反応物 4

HCID 784Hydrogen Peroxide3 回HCID 15672-MercaptoethanolHCID 7592AcetoacetanilideHCID 14798Sodium Hydroxide2 回

生成物 1

HCID 21307Carboxin収率 68.1%

反応条件

温度
38 °C

実験手順

Acetoacetanilide (88.6 g, 0.5 mole) is dissolved under agitation, at room temperature, in 140 g aqueous 28.6% NaOH (0.5 mole). Crude di-(2-hydroxyethyl) disulfide (176 g), obtained by oxidation of 2-mercaptoethanol with 50% hydrogen peroxide, (i.e. an approx 68% aqueous solution) is added to the reaction mixture, which is then heated to 38° C. After 15 minutes 15% aqueous NaOH (16 g) is added and after a further 15 minutes the addition of 50% hydrogen peroxide is started. Subsequently the reaction is carried out as described in EXAMPLE 1. A total of 16.8 g 50% hydrogen peroxide is used. The extraction/acidification procedure, as well as the cyclization step, is carried out as in EXAMPLE 1. After the last water wash, following the cyclization, toluene is evaporated from the reaction mixture under vacuum, at up to 60°, and the residue is redissolved in 90 g isopropanol. After crystallization, filtration and drying, 80.2 g 5,6-dihydro-2-methyl-N-phenyl-1,4-oxathiin-3-carboxamide is obtained (yield 68.1% based on acetoacetanilide), M.P. 96.8°-98.0° C., Assay 98.9%.

後処理

  1. extractionThe extraction/acidification procedure
  2. washAfter the last water wash
  3. customis evaporated from the reaction mixture under vacuum
  4. dissolutionat up to 60°, and the residue is redissolved in 90 g isopropanol
  5. customAfter crystallization, filtration
  6. customdrying

出典と根拠

ORDレコード
ord-88230becb7424cba91faf98660c6b7ed
出典データセット
uspto-grants-1982_11
特許番号
US04359579

関連ノート

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