Hydrochloric Acid → p-[2-(3,4-dihydro-4,4-dimethyl-2H-1-benzothiopyran-7-yl)propenyl]benzoic acid

HRID 37403ノート

反応式

HRID 37403 の反応式
[CH3:1][C:2]1([CH3:26])[C:7]2[CH:8]=[CH:9][C:10]([C:12]([CH3:25])=[CH:13][C:14]3[CH:24]=[CH:23][C:17]([C:18]([O:20]CC)=[O:19])=[CH:16][CH:15]=3)=[CH:11][C:6]=2[S:5][CH2:4][CH2:3]1.[OH-].[K+].Cl>C(O)C.O>[CH3:1][C:2]1([CH3:26])[C:7]2[CH:8]=[CH:9][C:10]([C:12]([CH3:25])=[CH:13][C:14]3[CH:15]=[CH:16][C:17]([C:18]([OH:20])=[O:19])=[CH:23][CH:24]=3)=[CH:11][C:6]=2[S:5][CH2:4][CH2:3]1

参加物

6

反応物 3

HCID 313Hydrochloric AcidHCID 14797Potassium HydroxideHCID 54104290ethyl p-[2-(3,4-dihydro-4,4-dimethyl-2H-1-benzothiopyran-7-yl)propenyl]benzoate

生成物 1

HCID 154196p-[2-(3,4-dihydro-4,4-dimethyl-2H-1-benzothiopyran-7-yl)propenyl]benzoic acid収率 65%

試薬・触媒・溶媒 2

HCID 702Ethanol溶媒HCID 962Water溶媒

反応条件

温度
50 °C

実験手順

1 g of the thus-obtained ester was dissolved in 20 ml of ethanol and treated with a solution of 1.6 g of potassium hydroxide in 10 ml of water. After heating to 50° C. for 2 hours, the mixture was poured on to ice, acidified with 2N hydrochloric acid and extracted repeatedly with ethyl acetate. The crystalline residue obtained after evaporation was recrystallized from acetic acid. There was obtained 0.6 g of p-[2-(3,4-dihydro-4,4-dimethyl-2H-1-benzothiopyran-7-yl)propenyl]benzoic acid, m.p. 255°-257° C.

後処理

  1. additionthe mixture was poured on to ice
  2. extractionextracted repeatedly with ethyl acetate
  3. customThe crystalline residue obtained
  4. customafter evaporation
  5. customwas recrystallized from acetic acid

出典と根拠

ORDレコード
ord-a6321f7ee1ec4be5b76a0755c13b240f
出典データセット
uspto-grants-1995_05
特許番号
US05420273

反応ノート

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