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Preparation of E-oxime ethers of phenylglyoxylic acids and novel omicron-phenoxymethylphenyl-glyoxylic methyl esters used therefor
Preparation of E-oxime ethers of phenylglyoxylic acids and novel omicron-phenoxymethylphenyl-glyoxylic methyl esters used therefor
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机译:苯乙醛酸的E-肟醚的制备及其所用的新型微米-苯氧基甲基苯基-乙醛酸甲酯
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摘要
Process for the preparation of E-oxime ethers of phenylglyoxylic acid esters of the general formula I …IMAGE… in which the variables have the following meanings: … … the substituents X and Y are selected from a group comprising halogen, C1-C4-alkyl, C1-C4-alkoxy or trifluoromethyl; … m is an integer from 0 to 4; … n is an integer from 0 to 3,… and in which … … a) a phenol of the general formula II …IMAGE… is converted into the phenolate, … b) the latter is mixed with a lactone of the general formula III …IMAGE… … c) the molten mixture is reacted, and … d) the resulting 2-phenoxymethylbenzoic acid of the general formula IV …IMAGE… is converted, via the acid chloride, into the benzoyl cyanide and this is converted into the corresponding alpha-keto acid, which is converted into the compound I. … … Alternatively, the compound IV can be converted, via the ester, into the beta-keto sulphoxide, which is reacted to give the beta-keto ester, which is subsequently converted into the compound I.
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