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    • 20. 发明授权
    • 3-substituted 2-hydroxy-3-formylpropionic esters, the preparation
thereof and the use thereof for preparing 3-substituted 3-formylacrylic
esters
    • 3-取代的2-羟基-3-甲酰基丙酸酯,其制备及其用于制备3-取代的3-甲酰基丙烯酸酯的用途
    • US5256813A
    • 1993-10-26
    • US883342
    • 1992-05-15
    • Franz MergerJuergen Frank
    • Franz MergerJuergen Frank
    • C07C69/675C07C69/732
    • C07C69/675
    • A 3-substituted 2-hydroxy-3-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 fomrula 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 eater 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.
    • 其中R1是低级烷基,R2是具有1-10个碳原子的直链或支链烷基的式Ⅰ的3-取代的2-羟基-3-甲酰基丙酸酯是通过将烷基 的II型和式III(III)的烷基乙醛酸盐同时与由仲胺和羧酸的盐或混合物组成的催化剂体系,使得 温度不超过90℃,优选80℃,或者将一种式II或III的反应物加入到上述催化剂体系和另一种反应物的混合物中,使得温度不 超过90℃。式I的2-羟基-3-甲酰基丙酸酯可以通过用脱水剂,特别是乙酸酐处理转化成相应3-取代的3-甲酰基丙烯酸酯的良好产率。