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    • 27. 发明专利
    • PRODUCTION OF PIPERIDINECABOXYLIC ACIDS
    • JPH07242630A
    • 1995-09-19
    • JP6029694
    • 1994-03-04
    • ISHIHARA SANGYO KAISHA
    • ASAI NOBUYOSHI
    • C07D211/60B01J23/44C07B35/02C07B61/00
    • PURPOSE:To industrially and advantageously produce a high-purity piperidinecarboxylic acid free from coloration in a high yield while inhibiting formation of a by-product by reducing a pyridinecarboxylic acid in the presence of a palladium-based catalyst and a reducing agent. CONSTITUTION:These piperidinecarboxylic acids of formula II can be produced by reducing a pyridinecarboxylic acid represented by formula I [X is COOH, CONH2 or COOR' (R' is a lower alkyl); R is H or a lower alkyl] in the presence of a palladium-based catalyst and a reducing agent. Palladium-hydrocarbon or palladium-sodiumtreated hydrocarbon catalyst is preferably used as the palladium-based catalyst and hydrogen gas is suitably used as the reducing agent. This reduction reaction is conducted preferably at 50 to 150 deg.C and 10kg/cm pressure of hydrogen. As the solvent of this reduction reaction, ethanol, water or a mixture thereof is preferably used. This compound of formula II is useful as an intermediate for production of medicines such as a quinuclidinebased medicine for senile dementia and agrochemicals.