Methyl chloroformate → Nalpha-methoxycarbonyl-DL-methionine amide

HRID 2270882ノート

反応式

HRID 2270882 の反応式
[CH3:1][O:2][C:3](Cl)=[O:4].[NH2:6][CH:7]([C:12]([NH2:14])=[O:13])[CH2:8][CH2:9][S:10][CH3:11].[OH-].[Na+]>O>[CH3:1][O:2][C:3]([NH:6][CH:7]([C:12]([NH2:14])=[O:13])[CH2:8][CH2:9][S:10][CH3:11])=[O:4]

参加物

5

反応物 3

HCID 6586Methyl chloroformateHCID 14798Sodium HydroxideHCID 5687422-Amino-4-(methylthio)butanamide

生成物 1

HCID 18329561Nalpha-methoxycarbonyl-DL-methionine amide収率 60.4%

試薬・触媒・溶媒 1

HCID 962Water溶媒2 回

実験手順

85 ml (1.11 moles) methylchloroformate were dripped into a solution of 150 g (1.02 moles) DL-methionine amide in 200 ml water at 5-10° C., during which the pH was maintained at 8-10 by the addition of sodium hydroxide solution. After 30 min of subsequent reaction, 60 ml water was added, whereupon crystals formed which were filtered off, washed with water and dissolved in 250 ml water. This solution was extracted twice and the crystallization mother liquor extracted once with 500 ml methylene chloride in each instance. After drying in a vacuum, 162 g yellowish, crystalline residue remained. It was dissolved in 200 ml hot ethanol. Then, 400 ml MTBE was added and after the appearance of the first colorless crystals another 200 ml MTBE. After cooling in an ice bath, filtering off, washing with 200 ml MTBE and drying, 127 g (60k) Nα-methoxycarbonyl-DL-methionine amide with a melting point of 93-94° C. was obtained.

後処理

  1. additionwas added, whereupon crystals
  2. customformed which
  3. filtrationwere filtered off
  4. washwashed with water
  5. dissolutiondissolved in 250 ml water
  6. extractionThis solution was extracted twice
  7. extractionthe crystallization mother liquor extracted once with 500 ml methylene chloride in each instance
  8. customAfter drying in a vacuum, 162 g yellowish
  9. dissolutionIt was dissolved in 200 ml hot ethanol
  10. additionThen, 400 ml MTBE was added
  11. temperatureAfter cooling in an ice bath
  12. filtrationfiltering off
  13. washwashing with 200 ml MTBE
  14. customdrying

出典と根拠

ORDレコード
ord-7dd267102c25483d9307fdc0a30a3531
出典データセット
uspto-grants-2001_12
特許番号
US06333176B1

反応ノート

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