HCID 53762775、化合物 → HCID 19905460、化合物

HRID 2371957ノート

反応式

HRID 2371957 の反応式
[CH3:1][C:2]1[N:3]([C:8]2[CH:19]=[CH:18][C:11]([CH:12]=[CH:13][C:14]([O:16]C)=[O:15])=[CH:10][CH:9]=2)[C:4]([CH3:7])=[CH:5][CH:6]=1>CO.[OH-].[Na+]>[CH3:7][C:4]1[N:3]([C:8]2[CH:19]=[CH:18][C:11](/[CH:12]=[CH:13]/[C:14]([OH:16])=[O:15])=[CH:10][CH:9]=2)[C:2]([CH3:1])=[CH:6][CH:5]=1

参加物

4

反応物 1

HCID 53762775HCID 53762775、化合物

生成物 1

HCID 19905460HCID 19905460、化合物

試薬・触媒・溶媒 2

HCID 887Methanol溶媒HCID 14798Sodium Hydroxide溶媒

実験手順

A mixture of 21.4 g of methyl 4-aminocinnamate and 50 g of acetonylacetone in 500 ml of toluene is heated under reflux using a Dean Stark water separator for 16 hours. The solution is washed with ice cold dilute hydrochloric acid, brine, and then dried over magnesium sulfate. The organic phase is filtered through silica gel, evaporated at 60° under reduced pressure and the residue is crystallized from hexane to yield methyl 4-(2,5-dimethyl-1H-pyrrol-1-yl)-cinnamate, m.p. 73°-75°. A solution of the ester in 150 ml of methanol and 100 ml 1N aqueous sodium hydroxide is stirred at room temperature for 16 hours. Methanol is evaporated at 60° under reduced pressure. The basic solution is washed with ethyl acetate, then made acidic with ice cold 5N aqueous hydroxhloric acid, and extracted with ethyl acetate. The extract is washed with brine, dried over magnesium sulfate, treated with charcoal, and evaporated to dryness at 60° under reduced pressure. The residue is crystallized from ether/hexane (2:1) to yield (E)-4-(2,5-di-methyl-1H-pyrrol-1-yl)-cinnamic acid, m.p. 189°-191°, also named (E)-3-[4-(2,5-dimethyl-1H-pyrrol-1-yl)-phenyl]-2-propenoic acid.

後処理

  1. customMethanol is evaporated at 60° under reduced pressure
  2. washThe basic solution is washed with ethyl acetate
  3. extractionextracted with ethyl acetate
  4. washThe extract is washed with brine
  5. dry with materialdried over magnesium sulfate
  6. additiontreated with charcoal
  7. customevaporated to dryness at 60° under reduced pressure
  8. customThe residue is crystallized from ether/hexane (2:1)

出典と根拠

ORDレコード
ord-791030c1e48f499bab1d3778ba6eebfd
出典データセット
uspto-grants-1992_03
特許番号
US05096919

反応ノート

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