Diethyl Carbonate → alpha-Methyl-alpha-(3-phenoxyphenyl)-malonic acid diethyl ester

HRID 1659801ノート

反応式

HRID 1659801 の反応式
[OH-].[Na+].O(C1C=C(C(=O)C)C=CC=1)[C:4]1C=CC=C[CH:5]=1.[CH3:19][CH:20](O)C1C=CC=C(OC2C=CC=CC=2)C=1.[BH4-].[Na+].CC(Br)C1C=CC=C(OC2C=CC=CC=2)C=1.P(Br)(Br)Br.[C-]#N.[Na+].[CH3:60][C:61]([C:68]1[CH:73]=[CH:72][CH:71]=[C:70]([O:74][C:75]2[CH:80]=[CH:79][CH:78]=[CH:77][CH:76]=2)[CH:69]=1)([C:65]([OH:67])=[O:66])[C:62]([OH:64])=[O:63].C(=O)(OCC)OCC>C(O)C.CS(C)=O>[CH2:4]([O:66][C:65](=[O:67])[C:61]([CH3:60])([C:68]1[CH:73]=[CH:72][CH:71]=[C:70]([O:74][C:75]2[CH:80]=[CH:79][CH:78]=[CH:77][CH:76]=2)[CH:69]=1)[C:62]([O:64][CH2:19][CH3:20])=[O:63])[CH3:5]

参加物

12

反応物 9

HCID 7766Diethyl CarbonateHCID 8929Sodium CyanideHCID 14798Sodium HydroxideHCID 24614Phosphorus tribromideHCID 36249Ethanone, 1-(3-phenoxyphenyl)-HCID 4311764Sodium borohydrideHCID 128824191-(3-Phenoxyphenyl)ethanolHCID 14670609alpha-Methyl-alpha-(3-phenoxy-phenyl)-malonic acidHCID 19915504alpha-(3-Phenoxyphenyl)ethyl bromide

生成物 1

HCID 19915501alpha-Methyl-alpha-(3-phenoxyphenyl)-malonic acid diethyl ester

試薬・触媒・溶媒 2

HCID 679Dimethyl Sulfoxide溶媒HCID 702Ethanol溶媒

実験手順

Several methods are disclosed for the preparation of the compound. The compound has been prepared for example by hydrolysis of 2-(phenoxy-phenyl)-3-propionitrile with sodium hydroxide in 50% aqueous ethanol for 72 hours (Swiss Patent Specification No. 527 155). The starting nitrile was prepared by methylation of m-phenoxy-acetophenone followed by reduction to α-methyl-3-phenoxy-benzylalcohol with sodium borohydride and followed by halogenation of the obtained product to α-methyl-3-phenoxy-benzyl bromide with phosphorus tribromide and reaction with sodium cyanide in anhydrous dimethyl sulfoxide (Swiss Pat. No. 527 155). According to another process α-methyl-α-(3-phenoxy-phenyl)-malonic acid is decarboxylated in a melt at 130°-160° C. The starting material was prepared by reacting α-(3-phenoxy-phenyl)-acetic acid diethyl ester with diethyl carbonate to obtain α-methyl-α-(3-phenoxyphenyl)-malonic acid diethyl ester which was hydrolyzed in aqueous alcohol by boiling it together with sodium hydroxide. The reaction mixture of the last step was purified by washing with ether in order to remove the starting ester as the hydrolysis was only partial (Swiss Pat. No. 527 155).

後処理

  1. customSeveral methods are disclosed for the preparation of the compound
  2. customis decarboxylated in a melt at 130°-160° C
  3. customThe starting material was prepared

出典と根拠

ORDレコード
ord-74fc248fb9854ef294a43e81e76a05da
出典データセット
uspto-grants-1981_12
特許番号
US04304930

反応ノート

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