Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Quality Control of: tert-Butyl 3-formylpiperidine-1-carboxylate, Which mentioned a new discovery about 118156-93-7
The present invention relates to new compounds of formula (I) wherein Y1 and Y2 selected from the group consisting of hydrogen, halogen atom, C1-4 alkyl, C1-4 alkoxy or cyano group, X is oxygen or two hydrogen atoms; Z is-(CH2)n-group or S; n is 1 or 2; R is selected from the group consisting of optionally substituted C1-7 alkyl, C1-4 haloalkyl, C1-4 hydroxyalkyl, C1-3OC1-3 alkyl, C1-4 cyanoalkyl, C0-2(NR1R2)alkyl, C1-4-alkylCOOC1-4-alkyl, C1-4-alkylOCOC1-4-alkyl, C1-4-alkylNHCOC1-4-alkyl, C2-7 alkenyl, C2-7 alkynyl, CH2O-(CH2)1-3-OCH3; an optionally substituted C3-7 cycloalkyl; phenyl; C3-7 saturated or unsaturated heterocyclyl or heteroaryl group containing 1-4 heteroatom; R1 and R2 are independently selected from hydrogen, C1-7 alkyl or C1-6 alkanoyl group-and/or enantiomers and/or racemates and/or diastereomers and/or geometric isomers and/or pharmaceutically acceptable salts thereof formed with acids and bases, to the process for producing said compounds, to pharmaceutical compositions containing said compounds and to their use in the prevention and/or treatment of mGluR5 receptor-mediated disorders.
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Reference：
Piperidine – Wikipedia,
Piperidine | C5H16552N – PubChem