3-substituted 2-hydroxy-3-formylpropionic esters, the preparatio

Details 3-substituted 2-hydroxy-3-formylpropionic esters, the preparatio 3-substituted 2-hydroxy-3-formylpropionic esters, the preparatio

1990-10-05

1993-04-13

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

562577, C07C 69675

Patent

active

052024610

ABSTRACT:
A 3-substituted 2-hydroxy3-formylpropionic ester of the formula I ##STR1## where R.sup.1 is lower alkyl, and R.sup.2 is straight-chain or branched alkyl of 1 to 10 carbon atoms, is obtained by adding an alkanal of the formula II ##STR2## and an alkyl glyoxylate of the formula III ##STR3## simultaneously to a catalyst system composed of a salt or a mixture of a secondary amine and a carboxylic acid in such a way that the temperature does not exceed 90.degree. C., preferably 80.degree. C., or else adding one of the reactants of the formula II or III to a mixture of the catalyst system described above and the other reactant in such a way that the temperature does not exceed 90.degree. C. The 2-hydroxy-3-formylpropionic ester of the formula I can be converted by treatment with dehydrating agents, especially acetic anhydride, into good yields of the corresponding 3-substituted 3-formylacrylic ester.

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